Mouse works well and is reasonably comfortable to use. The "virtual" scroll wheel is poor. If you're not careful then up down scrolling has ridiculous momentum (as if you'd spun a physical scroll wheel really fast). Left-right scrolling doesn't work in some applications. Bit of a gimmick really.
I've been using the mouse for a month and had one incident of the mouse losing connection to my laptop (Sony Vaio). Have to reboot the laptop to fix it. The battery life of the mouse is good.