The stability of OS X is just staggering compared to Windows. I've never encountered a problem that required me to reinstall the entire operating system or that I couldn't troubleshoot and solve within a matter of hours.
Ironically the media centre in my sig is such a fracking POS that I've been forced to use Vista on my Mac mini 24/7, and it is the most reliable media centre I've owned.
If Asus don't release the
Nova P22 machine here soon I'm just going to buy a second Mac mini to use as my media centre and maybe one day switch to an OS X media centre solution if one ever becomes mature enough.