Great little mouse! But here are the bad points
--If you leave the mouse a while it will go into a standby mode, when you move the mouse out of standby it will lag your curser making it slow and unresponsive for about 2-4 seconds
--Sometimes it wont recognise your mouse clicks.
--Only for right handed people (Im left handed and I get on fine with it, just something to consider if your a lefty like me!)
--Wireless USB nub is small and can get lost,
--They do give you a slot on the mouse to carry the USB nub which is a smart little feature when I remember to use it !
--Comfy grip and no slippage
--compact design, great for on the move
All in all I think this is a decent buy, its my first wireless mouse so I cant compare it very well but It does its job which is fine by me!