Seven is faster and more efficient than Vista. I have it running (with Aero off) on a 6 year old Thinkpad. It workss great, just as well as XP.

I also used Vista for 3 years, and recently moved to 7. It boots much quicker and uses less resources on a consistent basis.

Of course I realize that the plural of anecdote is not data but I haven't heard anyone contradict what I said.