I'm typing on a Satellite A135-S4427 that was Vista. I took that crap off and put XP back on and it's been great.
My Dad wouldn't let me downgrade from Vista when I first got the PC a few years ago. So I waited (forever) for 7 to come out. So far no problems…except the issues with the FN key, which is now fixed. I also took the time to upgrade my BIOS on the board.
When I first upgraded to 7 last year, I saw numerous blue screens and lock ups. Two months later, it purred forever.
Still purrs. For now. I just don't like the 1.6GHz AMD processor…4 gigs of RAM and not a whole lot of processing power.