I am running Mac OS X on my desktop that I assembled for hackintosh. I also use Mac OS X on my Gateway NX260X. I ditched all Linux and Windows systems for good, and now only use Mac OS X on those two and my real Mac.
Linux was easy to give up because Mac OS X is really a UNIX system, and because Linux clients sucks big time in multimedia applications. Windows was a little bit harder because of Microsoft Money and DVD Shrink, which I have used for 7 years, but I finally gave them up.
I use Mac OS X for mostly coding in C/C++, typesetting in LaTeX, making slides with Keynotes, and playing tunes and movies. I am really happy with my desktop hackintosh because it is stable and fast and virtually requires no maintenance.
One bad aspect of hackintosh that no body talks about is the addiction
(or maybe just for me). Whenever I see a possibility, I change a machine into a hackintosh. I have convinced my friends and changed their machines into hackintoshes (three of them so far).
I use Mac OS X for 8 hours at home and school and Linux (on the desktop in my office) for 2 hours at school.