I love it a lot, and would use it full-time if my games ran in it well.
The best feature: a stupid little program that comes with it that acts as a Japanese dictionary and flash-card system.
That alone made it all worthwhile to me.
The worst feature: my taskbar (which I sat to auto-hide in KDE) does not pop-up and flash when someone messages me in Gaim, and thus, I spent hours and hours ignoring people simply because I had no clue they were talking to me.
Speed-wise, it runs much faster and more smoothly than XP, but not faster than XP64.