Others say...

"Didn't work"
Make sure you buy this at a retailer that allows returns if it doesn't work. I bought one last week after a presentation. It looked and worked great at the presentation. I bought it because I had an immediate weekend-long project where I needed correct color. When I set up my new Eye-one/Display 2, all I could get was a "fail" on the emissions test, over and over - and never did get to testing my Mac LCD monitor. No response from the Eye-one "support" to my e-mails.

I brought the gadget back to the store that then told me I had moved it during the test or the screen had gone black - and that was the only reason it failed. Neither of those were true. ...However, I did get a refund. So, beware. I'd like to give it a 4 or 5 on the basis of what I saw the demo do, but for how the one I bought worked, I'd give it a zero. Had the "support" even bothered to respond, I would have tried to work with them rather than doing a return since I really did want it to work. Average the scores for a 2.

"Overpriced, confusing software, misleading advertising, poor technical support"
I am a photographer. I wanted a device that would help me match my computer monitor display to my prints. This device does a good job of calibating your monitor, but does nothing to help you calibarate your printer. The software that ships with the device has many options of which most are "greyed out". For instance, options for calibrating your printer are "greyed out". Why the heck show the options on the screen, if they are not included in the product! When you call tech support you get a response in about 36 hours. An overbearing jerk explains that printer calibration is not included in the product, but you can buy another product for several hundred dollars more, which will address that. The same company offers the Huey for about half the price of this device. You would expect for twice your money you would get twice the value - right? Wrong! As best I can tell the Huey does everything this device does, and more. This device cannot monitor ambient light, which is a feature of the Huey.
The device has two modes for calibrating - simple and complex. Simple works pretty well. Complex is useless. I have tried to use the complex option numerous time and have never obtained any better luck than with the simple approach.

"Top marks for the Pantone Eye-One Display2"
I read many reviews before deciding which product to purchase for monitor calibration.
Before starting the calibration process I checked for product updates and found that one existed. The software update was a cinch.
I'm pleased with the simplicity of this product and the results I've seen on my LCD monitor and my laptop display.
If you're searching for a monitor calibration hardware/software product I'd strongly suggest looking at the Pantone Eye-One Display2.

"easy to use"
simple to instal for good result
small and take no place

"Waste of time!"
Program would not work, updater would not work, tech support was not available because of overload.