I just recently bought the Logitech V470 to replace my Mighty Mouse. I disappointed of its performance. It always has this jumpy/sluggish feel every time it is not used for awhile and then when you move the mouse you will feel the sluggish movement for like 1-2 seconds. It doesn't feel nice at all. I think this is because of the power saving management? Anyone has the same issue? Is there a way to make it on all the time? Battery life is not really a problem for me. Another issue I found is that this mouse's middle click must be push very hard and quite long period only it performs the action. Very annoying. Need some suggestions from V470 users regarding these issues. Thanks.