i've owned about 6 different mice up to now and this one is definitely the worst one.its appearance is OK but it really isn't a pleasure to use it. i really would like to return it had i not thrown away all the packages coming with it.as another reviewer said the biggest problem is that the mouse cursor once in a while will jump every where on your screen. for typical usage like editing a file, internet surfing, this isn't a big deal. but it really hurts your game playing. this didn't happen when i just started to use it but it got worse very soon and right now the cursor would behave crazily about every 2 minutes. so don't buy this one.