I recieved my mouse on time but within 2 weeks or useag it just stopped working, i think it may have had something to do with the optical light as clicking was still working but no movement.
I recieved a replacement very quickly when i complained but exacly the same thing happened. I think it's most likely a fault with the mouse and this should be looked at.
This is a very nice sized mouse and very well designed ergonomically. Fits in the hand comfortably. Very responsive movement with responsive buttons and very effective scroll wheel. It is also light, great for portability. The nano wireless USB has been plugged in since it arrived, I forget its there. Highly recommended at this price.