Surprisingly fast. Faster than win2k. So far ZoneAlarm won't run because Windows detected an incompatiblily and disabled it. Norton antivirus warned me it would not work so I didn't install it. Netscape 4.78 browser works fine, did not try the mail.
The default user interface is too different from win9x. You can change it to look like previous versions though.
btw the user interface reminds me of saturday moring cartoons. Get'em while they are young Microsoft.
I like the lack of reboot after installing programs.
IMHO Microsoft will push winxp like no other os they have made. EVERYTHING will be designed ONLY for xp so you have to upgrade and they can get the registration thing universal. From my point of view thats not too bad though. No more arguments with customers over why I won't put unlicensed software on their computer.