Evrey one i know that upgraded had a problem with bugs. But if you just buy a new computer with Vista already on it you wont have as much problems.
Well #1 its very bloated. You have to use twice the system resources and the only real difference in XP and Vista is the GUI(or the "chrome", if you will). I can get a better looking GUI under Ubuntu Linux for free so why would I want to use Vista especially since Microsoft has even given up on it(Windows 7 is on the way ALREADY.) Vista is the new ME(Anyone remember ME it came out after Win98 in 99-2000 before Windows 2000). I expect that Windows 7 will blow Vista out of the water and be worth the upgrade from XP.
I am using xp from last three years and i am satisfied with it . you can say it is fulfilling my all needs and i can use it for next 2 more years . .