I've purchased the upgrade to Parallels for Mac Desktop V5.0, but I am reluctant to upgrade, based on allthe negative reports I have read about how slow WinXP is after the upgrade. Has anybody upgraded successfully. Any favorable reports? Has the Parallels team resolved the upgrade slowness issues? I simply can't afford to be sidetracked, or waylaid if Parallels Desktop for Mac is not SOUND. Please advise.