lots of us have, dont forget, the RTM build of Vista has been available to corporates for the last 2 months. As with every MS operating system, its slower than the one before. Unless you really feel the urge to update, XP will do you just as well IMO. With the lack of 3d support, you dont get to use the Aero interface anyway... (and even if parallels did have 3d support, whether it would be of a good enough standard to run Aero is questionable)