My main problem with every version of windows is that it get's gradually slow, buggy and unreliable just by using it for a few months. Let alone if I abuse it and install/uninstall/test in it.

Right now vista is about to die on me, the taskbar flikers, boot time takes forever, sometimes my user session wont close properly, bluetooth crashes while not in use, and a long list of etc.

I use linux too, more than windows actually, and I abuse the poor system with beta kernel recompilations, test packages, test servers, all kind of libraries and software, and is as stable as the first day.

I'll switch to W7 soon and see how that goes, I've tried it and it does runs great.