Hey Q,
The Microsoft XP OS filters thru my bat-puter as I type this. Boot time is very fast for me, it feels smoother since I got rid of my crashing problems with Windows 98 second edition. It feels good, a little time to get use to though.
If any problem, it's the choosing to be compatible to certain programs by XP.
My CD burning program (Easy CD creator 4.02) is not compatible and they won't be creating XP drivers for it, so I have to buy version 5 at $99!
Totally pissed me off. If you got a lot of programs, make sure you check which ones XP is compatible too. I hear NERO burner doesn't work for XP. Check out the Microsoft XP newsgroups, quite helpful as well.
If you currently like your existing OS, stick with it I say, I only decided to upgrade cuz of my consistant crashing. I haven't crashed yet with XP!
DK