Adobe pulls this maneuver on OS X as well. Other Mac apps will try to sneak in some global software for cool effects; I've had Growl installed three of four times without my consent. Obviously the Windows installers were worse on average, but I think OS X would have gone that direction if not for sandboxing. If sandboxing hadn't turned out to be awful I would upgrade. The idea is really good for users, but their implementation is lacking.