I have just changed over to Win 7 on both my computers. I had bought a laptop with Vista on it and hated it, but stuck with it as Fujitsu had no drivers for most parts of it to work with XP, so I couldn't go backwards.
My tower had XP on it and was doing fine, but I had always wanted to network the two and had never had any success.
Now both computers are on Win 7 and networked it is a fantastic world, being able to print off things without needing to carry the laptop upstairs and start pulling out cables and connecting up the laptop.
Win 7 is so stable it is what I have waited for since 1994 when I first got a computer and was running Windows 3.0.
If you do make the jump, I wish you well, I am pleased I did.