As i said i have used it for a year now with minimal problems. Each person has their own idea what buggy is and what they think is buggy. Some people feel that evenaa minor inconvience, such as a applicaiton not being able to run on Vista, a bug. When in fact it isnt a bug. That is the problem of the people who made the software not makeing it Vista compatible. Same thing with Drivers. That is the fault of the hardware device makers.
While yes there are some things that are wrong with Vista. Copying files at first is a major annoyance. But there are plenty of updates and patches to get that working correctly. Most of which are available via Windows Update.
So while many peopl here would call me a Vista Fanboi i have to say i am not. Since i am within Ubuntu right now typing this an have not been in Vista in over a week.
So each person has a different experience. I can not tell you how your will go or if you will find bugs. I can say that i personally love Vista and am glad i went to it.