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#11
I have multiple computers in my home. My primary machine was built in July of 2009..and with Windows 7 being free (Beta and RC1)..that is what I used there. Then I moved to a retail copy of the software when it was available.
My wife has a laptop with Windows Vista. Like you, my experience with this laptop has been favorable. No problems, good performance, already licensed, and a recovery setup that allows me to very quickly put it back exactly where it was the day it was new without having to use any 3rd party software or pay for a license, etc.
I've found no solid reason to spend the money to upgrade my wife's laptop. I expect Vista to be supported for the lifetime that I own this laptop..which will only be for 3-5 years.