I chose MC16 because of its combination of bit-perfect audio (via WASAPI), a killer database, and a well-thought-out user interface. I am using it on a 2009 MacBook Pro 17" with 8GB RAM running Windows 7 Ultimate 64-bit. I play that in turn into some rather nice high-end hi-fi equipment. My MacBook will also boot into OSX 10.6 and I was recently persuaded to listen to a music player called Audirvana which runs under OSX. I have to say that the sound quality played through OSX/Audirvana is really VASTLY superior to that played through Win7/MC16. I am seriously puzzled as to why that should be, and I would like to read other people's thoughts on this, since I am very new to computer audio. Do you think it is due to OSX vs Win7, CoreAudio vs WASAI, Audirvana vs MC16, Integer Mode vs Floating Point, or what...? Do you think I am full of sh#t?... I am gutted that Audirvana sounds so much better than MC16 (at least on my set-up) because MC16 is SOOOO much easier to use.