I bought this mouse(black) couple of months ago and paid 4.99 pounds from another seller on this site. Last night I smashed it against the floor in frustration! It is cheap but not cheap if it doesn't do the job properly.
-Looks good on the picture
-Doesn't come with any software to configure the buttons. For me, side buttons were configured the wrong way around
-Batteries(2XAA) can not be fixed properly, especially the second one which is on the top of the first one diagonally, keeps popping out of it's slot
-The whole for the wheel is too big and catches the skin of your finger when you roll the wheel
-Mouse behaves erratically. You never know how many clicks it is going to produce
-Back button often goes two or three clicks back
-Batteries don't last very long (about 10hours)