ßăķëď Äłáşķǻñ: I have limited exposure to Vista. But what I have seen is not good. I would expect many programs to quit working once you upgrade (crossgrade? downgrade?) to Vista. I am a Software developer and several of my company's products don't work on Vista. Some of the products we interface with also don't work.
It also seems to be cumbersome to use. Our software, like most, is not "Signed" and does not have a "Trust Certificate" with it. So, Vista ALWAYS asks "Are you sure" every time we try to run something. VERY annoying after a while.
Finally, as with any Microsoft OS, I would wait until some "Service Packs" have been released to fix the expected bugs.