Excerpt: This is the worst mouse I have ever used. It freezes, is totally unresponsive and very frustrating. It is worse that the old one I was replacing. I wish I would not have purchased it. It is a waste of money for our non-profit company.
Summary: Like I said above - I have not run into any problems with it. It's a nifty mouse to have. The only thing that would trump is, is getting one of those logitech awesome powered ones. But, if you're looking for a mouse that does what it needs to do with a ergonomic USB plug-in - get this one!