Why I buy this one ?
- 4000dpi Razer Precision 3G Laser sensor
- Up to 100 Inches-per-Second tracking speed
- Nine independently programmable Hyperesponse buttons
- 32KB Razer Synapse onboard memory
- On-the-Fly Sensitivity adjustment

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What our customer's say!

"Not my style of mouse", I just purchased a Lachesis. I have found that it is not really for me... I use the fingertip style grip more than any other, which feels really funky with the extra wide front area of the mouse... The buttons on the left side are also very hard to click with any style of mouse grip. I do like how lightweight the mouse is though, that and it is very grippy. Seems to work pretty well on my Thermaltake Flare Pad mousepad. The fading in and out effect of the blue light through the Razer logo is pretty cool too. Needless to say, I just ordered a Diamondback 3g, hoping to fix the problem I had with the grip issues I had with this mouse, though I do hate to get rid of the 4000 dpi, when setting it to 1600 dpi, it seems to do well enough for me. I did attempt using the claw grip, which seems to be better with this mouse, however I still prefer to use just my fingertips, so I will be taking this one back to the store where I got it... I'll review the diamondback after I get it. Hoping that the smaller size, and less 'funky' shape works better for me.

"Best mouse I have owned so far", I have used many kind of gaming mice in the past including Logitech G5. But Lachesis has been the best so far. Light, fast and accurate. It fits nicely in my hands - which are not too fat nor too thin. The feel of holding this mouse is just perfect.
The bad thing is that I have to take the mouse out during the night because the light on the mouse is a bit too bright for me during the night.
Highly recommended for serious gamers.
This does not mean that the Lachesis is just for gamers, its for business people as well. I have done a lot of spreadsheets and power-points as well with this mouse - with as good ease as any of them.

I used this mouse with my MacBook pro as well. And as expected, it works very well with Macs. As a matter of fact, this one felt much better than the Apple's own Mighty mouse (both wireless and wired).
So highly recommended for Mac users too.

"Great mouse", I have 2 copperheads ... which are also as great .. got this one for photoshop and 3dmax work ...awesome

"Lachesis", Great mouse.

this is the second time i have bought this mouse. very smooth and it has a great polling rate.

highly recommended for any fps player out there.

"Terrible Product", I can't believe companies put broken products like this on the market. This is by far the worst mouse I have ever owned. The mouse skips all over the screen. The cursor randomly gets hung up and won't move. The cursor moves by it self. The buttons double click randomly. You would think it can't get worse right? Razer released firmware and drivers to try and fix the mouse. This software is corrupting many peoples computers so they have to completely reinstall windows.

Save your money. Don't buy this piece of junk. Use a ball mouse before you buy this thing.

Read this reviews before You buy...

"Razer should be ashamed", Razer is one of those manufacturers that make products that people either love or hate. I've personally been one of the admirers. In fact, I have a Razer Diamondback plugged into my computer right now as I am writing this review. But despite my personal liking for Razer, I cannot give this mouse anything more than 1 star. As other reviews claim, this mouse has a glitchy sensor that jumps erratically. This is a big no for serious gaming. Heck, any glitchy mouse is a big no for anybody anywhere. You can buy a $30 'gaming' mouse that does its job wonderfully, including Razer's own Krait, so why would Razer call this a gaming mouse I have no idea.

First of all though, props to Razer for making a mouse that is technically most advanced ON THE PAPER. 4000 DPI! Wow, that's 800 DPI more than the closest competitor, Logitech G9! And to think that most people today are using a 800 DPI mouse! Amazing! Haha, you'd wish.

The simple truth is, nobody needs a 4000 DPI mouse in the first place. There are some people who go nuts over high-tech gadgets, and they are probably the targetted victims who bought this mouse, lured by high numbers. But DPI is just one of many factors to consider when purchasing a mouse. In fact, DPI does not even tell you if it is a good mouse or not, due to the fact that some mice use laser technology while others are optical. The difference is that with laser sensor, it is easy to get a high DPI. The first generation laser gaming mice such as Logitech G5 and Razer Copperhead both featured 2000 DPI, and this was back in 2005. Today there are dozens of laser mice on the market that performs at 2000+ DPI, including products from some cheap imitative manufacturers that nobody's ever heard of. On the other hand, optical mice have only gone up to 1800 DPI, and only Razer and Logitech have been able to achieve that. This may sound as if optical technology is inferior, but trust me, it's only the one side of a same story (1800 DPI is more than what anybody needs), and sadly higher DPI is about the only advantage laser sensor offers, really. For more information, google esreality mousescore 2007. Laser mice lose perfect control at a lower speed than optical counterparts, and there is no exception as long as you are comparing two mice in the same price range, There is sufficient data to prove this if you really want to know more about it. That being said, I think Lachesis would a ripoff, even if it did not have the serious glitch of jumpy, erratic movements.

Still, Lachesis has a very powerful sensor, no doubt. But Razer was not thinking about their loyal customers when making this mouse. After receiving much praise and numerous awards for their self-proclaimed 3G infrared sensor, Razer really did not have to add another laser mouse in their arsenal. But since the new Logitech G9 featured a powerful laser sensor which performs at 3200 DPI, which was almost twice the DPI of the critically-acclaimed Deathadder, Razer decided to make a new laser mouse on their own to compete directly. The outcome of Razer's ambition is Lachesis, which overkills any other mouse on paper. But does it overkill any mouse in reality? No, because to achieve 4000 DPI, Razer had to incorporate a super-sensitive sensor which picks up vibration and dust on the surface. Nobody wants that, especially gamers who have to rely on the stable tracking of their mice.

So in the end, this is but a disgrace of a product which fails to fill its niche. It was supposed to be a gaming mouse, but it's only gaming mouse theoratically. Razer probably created this mouse only because of the neccessity to compete with Logitech in technological term, not because this is what customers want. Trust me on this guys. 1800 DPI is more than enough for anybody unless you have resolution set at a ridiculous 2048 x 1536 or something. And with only 1800 DPI, Deathadder achieved the highest score in esreality mousescore 2007, by a big margin too. If this does not convince you to think twice before buying a laser gaming mouse, I'm sorry, but there still are good laser gaming mice out there, just not this one. Logitech G9 is great. It really showed me that as optical technology advanced over the past years, so could laser technology. If you are looking for the best performer for the money though, I highly recommend Deathadder. For fingertip users who prefer the slim, symmetrical body of older Razer designs, luckily now the same sensor from Deathadder is incorporated into the new Diamondback 3G, and soon in the Salmosa, so there are many viable options to choose from. This has been the only case in which I was disappointed in Razer. I always appreciated the fact that they continued to make new optical mice (now only in infrared because they're 'cooler') even though their competitors Logitech and Microsoft have already moved on to laser market to capture gamers' attentions, because a laser mouse can produce a more impressive DPI easily (although depressingly low IPS compared to optical sensor, but they don't state the IPS in specification so doesn't matter...) Razer Lachesis strenghtened my view that Razer should stick to their infrared technology. I hope this convinces you to not purchase this or you will most likely regret it unless you are switching from a basic $10 mouse, because then you really don't know how good the affordable $30 gaming mice actually perform.

P.S. Maybe a new 'batch' of Lachesises will have the problem fixed. But for now avoid this...this is an expensive mouse anyway :]

"Great Mouse", I installed the latest firmware update and the mouse works flawlessly. Very precise control for gaming, good overall function.

"Jumping mice", I am expirenced with shooters and mice. The other Razors that me and my boys own have never jumped. This one, even with the newest drivers, 1.64, still jumps. It seems to always jump at the wrong time. Any time is a bad time though. But you say sound affects this mouse. I'll test it and see. When it's working, it's working good. Well, I did check the mouse with no sound around and it still did the same thing. Very disappointing.

"A Frustrating Mouse", I purchased the Razer Lachesis after building a new PC for myself. I'd been using the Logitech MX Revolution prior to that, but decided I'd use that one at work and keep the Lachesis at home. My main reasons for choosing the Lachesis were a) it looked cool and b) it was expensive (so it MUST be good, right?), relatively speaking.

I've been using it for a couple months, and just recently decided to retire it and bring my MX Revolution back home. The Lachesis IS pretty nice looking (it matched my Razer Lycosa keyboard quite nicely), but using it is a pain.

The problems with the Lachesis aren't with the onboard memory or programmability or the software. They're much more fundamental, which in my opinion, is nothing short of a complete failure for a mouse. In a nutshell, the buttons are overly-stiff. They're too difficult to press.

To be more specific and to provide a little background, I'm a web designer. I do an extensive amount of work in Photoshop, manipulating pixels. I use a pen tablet for much of it, but I still need to be able to make extremely precise movements with the mouse occasionally (i.e. make selections that are of a specific size, right down to the pixel). The problem with the Lachesis is that, yes, the movements can be precise... but once you exert the required amount of force on the mouse button, you've moved the location of the pointer.

The precision with which you can control the pointer is great, but the buttons on the mouse make that precision utterly useless. I hated using this mouse.

For general web surfing, I suppose it was fine, though the thumb buttons were awkwardly placed, requiring me to shift my hold on the mouse to press. They, too, were too stiff, too difficult to press without moving the mouse.

For ANYTHING requiring even the slightest degree of precision, the Lachesis is worthless.

Unfortunately, it's going into the storage bin, and I'm going back to my MY Revolution. Razer could take a few lessons from Logitech on the tactile quality of mouse buttons and placement.

"Intended for professional users ONLY!!!! ", Anyone who gives this mouse a bad review probably has not taken the time to manually tweak their mouse for the surface they are running it on. I am using mine on a Razer mantis surface. Yes I did use the Beta software that Razer is telling their users to use. Here is the thing. It took me a whole month to realize this is hands down the most amazing mouse I have ever used? Not sold yet? Here is why. The mouse features onboard memory for 5 different profiles. Out of the box the mouse is not configured. Literally every aspect of mouse tracking can be tweaked with the Lachesis. What I mean is when I am playing a shooter I use a high polling rate and take full advantage of the enormous DPI this mouse has to offer. Shooter for me is profile 2. Profile 1 is for Windows use and tracks much slower. Profile 3 is somewhere in between the two and is for playing strategy games. Profile 5 (i dont use 4, I just hit back from 1) is for movies (which is on very low settings) because you will find that the vibrations in the air caused by sound waves ARE picked up by this mouse!!! AMAZING!!

The only reason I dont give it 5 stars is because when using OS X the mouse doesn't work the same as in windows but it still works fine for careful photoshop movements.

Anyone who gives this mouse a bad rating is spending their money on all the wrong things!! If your not ready to take the time to research how laser mice work then DONT BUY IT!