As a mouse, the movement is very sensitive, and it has proven to be quite reliable. It is quite small, and I have found it very handy to use. What the description does not mention is that the main feature of clicking does in fact use buttons. When first using the mouse, I found difficulties pressing these independenly of each-other.
Another point to make is that the mouse is quite uncomfortable to use. It is not the most uncomfortable thing I have ever come across, but it can make your hand ache after a while, as the shape does not really help your grip.
The scrolling function using the touch sensors works extremely well and responds nicely. However, it is a little more difficult to use the multitouch feature to go Back and Forward, at least, without holding the mouse in your other hand as you do it!
The on/off switch is great, and the nano-receiver is small and unobtrusive. Overall, not a bad purchase!
EDIT: I have since used the mouse a little more, and found that it is getting really annoying. The sensitiveness of movement means that any accidental moves are greatly exaggerated, and for prolonged use it is difficult to control. As well as this, the difficulty in performing even the simplest of clicking without accidently activating something else has been extremely frustrating.
I conclude by saying that although it is a neat mouse, and works well for simple tasks, I would recommend using something else if even the slightest degree of accuracy is necessary.