Since I support Windows Server and XP Pro at work, so when I come home, I want a break. I got a Mac Pro and run OS X for a more relaxed experience. I haven't even had to load VMware Fusions or Parallels to run Windows software since I have Office on the Mac. Even if I do need something in Windows, my wife and son have XP boxes I can use.
Plus, it has a stable SMP Folding client... Just like Linux.
Plus, it has a stable SMP Folding client... Just like Linux.