Bought a lappy with it already preinstalled in the States and haven't noticed any bugs with the software as yet!
It's got a few nice features like the gadgets on the wallpaper screen and one or 2 other nicer touches about it, like preview screens, transparent boxes, Media Centre etc. but they've also overcomplicated some of the tasks, like switching the thing off now takes slightly longer because of the 7 options
Almost everybody will upgrade to it eventually, but for now it doesn't seem worth the cost if you've already got XP!