The tracking sensor is second to none, just to prove the ability of it I tried playing call of duty while tracking across my face, no problems! worked fine on my duvet, and it has enough range for me to sit in bed and use it to control my pc dvd player from across the room fine. Battery typically lasts for about 2 weeks at 3hrs constant use a day, but that said I haven't run it down form a full charge so don't take that figure as fact!
The cruise control buttons are now better placed, as is the function switch button, and the side-scroll puts microsoft to shame. If you haven't already got an mx-series mouse and are looking to upgrade, this is your mouse.
It is currently 20 pounds more than the Logitech MX 700 Cordless Optical Mouse. Which is a lot of money. But, if you are already prepared to spend 40 pounds on a mouse the extra bit may not seem too bad. It is very easy to install and sits in your hand perfectly.
The charging cradle is rhobust and charges the mouse very quickly. Whilst also being very slick...
I have had no problems with this item