Others say...

"I've had this mouse about a year now"
It's really great and I haven't had any problems at all with it. There are probably newer mice out now that are better but this one is still a great upgrade over most mice that come with a new computer.

"Takes a lickin' and keeps on tickin!"
Initially I balked at the thought of paying more than $15 for a mouse (this was back when you would have to pay $50 for this model.) and considered it for a long time. My biggest thing is that it has to be able to multitask and whether I'm in a video game or surfing the web, ALL buttons must function. Period. Having decided to upgrade to "gamer" equipment, that too caught my eye.
Upon arrival I thought that perhaps the shape might pose a problem, as I was used to the rounded-dome mice. It fit comfortably and snuggly in to my hands and all buttons were within easy reach. I have never had an issue with it being unresponsive or jumping around that wasn't solved by removing a stray cathair from underneath the optical sensor. It has gone strong through 3 moves and 2 years worth of gaming and the only thing that bugged me was the pads on the bottom wearing down and wearing off.
I adore this thing. It has become virtually indispensible when I am online with MMORPGs, allowing me to save moving my hands to different parts of the keyboard to strike hotkeys that were taken over by buttons on the mouse (and I didn't have to program them, to boot, it naturally picked up some of the more useful commands!)
I like this thing so much that when my last one met with an unfortunate orange-juice incident that warped the left click and stuck the back and forward buttons above the thumb, I immediately went out and tried to find another one. I'm glad I did, as I find this to be an incredibly reliable and useful mouse, and I have not once regretted the money I spent on it.

"Great, but..."
This mouse is great except for one major flaw. I haven't heard of it anywhere else but it has happened on 3 different computers. After having the mouse/computer on for extended periods of time, when I turn it off and then back on later, the optical light will not turn back on. It takes from a few minutes to several hours, usually the latter. Ruined the mouse for me...

"Great Mouse!"
I love this mouse. I have owned it for a couple years now, and haven't bothered to changed to anything else, and if I did, I would just upgrade to the laser version of this same product. It fits perfectly in my hand, has many useful buttons, and I really prefer it to my other mice (which includes a MS Wireless Intellimouse Explorer, etc)

"Good mouse!"
Stylish, responsive, high resolution, good contours, and button location. I have one at the office and at home. Very satisfied.