I had an used PowerMac G3 (B&W) that I ran OS 9. I upgrade to Mac OS X 10.0, but still used a Windows-based computer as my primary computer. Two things made me ditch Windows completely. Jaguar (10.2) and iPod/iTunes combo. At that time the best experience using an iPod was with a Mac. Macs had a firewire port that the original iPod used as a connector. Windows was using MusicMatch (ahh...memories) at the time and you needed to install a firewire card. 
After that, I stop using Windows full-time (at home). Work still use Windows, but not much I can do about that.
After that, I stop using Windows full-time (at home). Work still use Windows, but not much I can do about that.