After 5 years spent with my PowerBook G4, which was an admirably well conceived laptop and 1 year with a MacMini; as the later was meant to become a multimedia center, he is now coupled with a nice FullHD TV and I am back using Linux Debian for my daily work and no computer for my private stuff.
Before switching to Mac I was living a happily windowless live( the 5 years before my switch to mac) with Linux. The last distribution I used for at least 2 years was Gentoo. But it went from hard to very hard and time consuming to manage; and I had less time to be my own system developer/administrator, so I decided to give Mac a try.