Have to disagree with MrLabGuy and swesson. My Dell 8400 (purchased in Nov 2004!!), has been 100% stable after upgrading to Win Vista. I have many upgrades in it and many devices connected.

Experiences may vary. I'm not a fan of sweeping statements of how bad an upgrade (of any product) may be based on a small samples.

And, based on what I've read, OS X may be better than Win Vista but it's not really a valid comparison. There are so many other factors to consider...

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2008 X5 4.8i | Wheels: Summer> style 336 20" RFT; Winter> style 214 Ferric Grey 20" RFT | Aero kit | ESS E-Flash tune | V1 | LCI Rear Tail Lights | Coding completed | Engine replaced at 90K