The big selling point is of course, the receiver. It's tiny, which means you can plug it in to your laptop and forget about it. No danger of it being knocked or having to unplug it when you move around.
The mouse works well, you can easily toggle the mouse wheel from clicky to free flow. It works well on any surface.
My only issues are the size of the mouse. It's small (which is ok, it's for a notebook after all), but it's also low-profile, so it doesn't fit well in the hand.
To conclude, great receiver, average mouse, relatively expensive.