Due to some weird problems with a wireless mouse with various OS's and machines I decided to go back to a wired mouse. I hunted around a bit and found nothing but good reviews for this mouse.
The price is very good, you can get gaming mice for 2 or 3 times the price (and the rest). It's a nice size so fits my hand well - i.e larger than any laptop mice I've tried. I messed around with the weighting system and you can feel the difference in removing them. Also the configurable software gives an enormous amount of potential, to be honest I'm probably using a fraction of the capabilities of this mouse.
I've only played a few games with this, but of these Dragon Age and Crysis both require decent mouse control which this gives in buckets. Works just as well in everyday tasks like browsing, email, excel etc without feeling clunky.
I would recommend this with complete confidence, excellent and for the price it's a steal.