I know you're going to say, oh look, another Magic Mouse user who needs Mousezoom to come to his rescue. Nooooo, I've done that and it still feels like it's lagging behind and it's not reacting to what I want it to do. It's on a wooden surface with a few lines in (usual tree lines) so maybe these lines are affecting the tracking? I can crack Mousezoom up and it's fast but it still feels slow in reacting to my movements. Maybe I need to get used to it more but I'm not liking the Magic Mouse at the minute.