Ive re-installed it 3 times so far, but only because of Motherboard & CPU changes.
Its been very stable for me and I have no intentions of going for Win 8.
The best part is I got Win7 Ultimate for free by throingw a win7 house party when it came out.
It was silly, All I had to do was invite a few friends over and show them win 7 and take pictures of the event. They sent me napkins, Ballons and a puzzle, win7 tote bags for all my guests and a copy of win 7 64 bit Ultimate for me!