I use an MM in my bedroom as HTPC! I built a custom PC not 18 months ago, decent spec i7 and all that and yeah it was great but still it run on Windows, as I have always been a mac fan boy I got the new MM and what an amazing difference, why I ever doubted myself and built the PC I will never know.
Love all the little available apps on the mac, all mac app designers seam to have an eye for such a great GUI, each little app I use, weather it be ripping Blu-Rays or coding it is just 100 steps ahead and all such small less CPU intensive programmes.
I currently own -
iPhone 4 (had each iPhone on launch day [/sad])
2006 MacBook Pro
2009 MacBook Air
MacMini
iPad 1
Will hopefully be getting an iPad 2 soon as well. Work on MacMini at work and they are fantastic! I am a part time graphic designer and the old Pro still handles CS5 easily and it isn't the most specced up mac either. Saying that I do have a good infrastructure of a network - perks of being a network administrator eh