I ran into warranty issues with the last Mac I owned, and swore never to buy one again.
But even if I did, I'm not sure it would run a sane Linux distribution out of the box (from what I'm reading, it's a bit touch and go,) and I don't consider a computer usable unless it can run the setup I need, which depends heavily on Linux -- developing on Mac OS X and deploying to Linux never worked for me: I could never keep a "sane" environment with the former.
But even if I did, I'm not sure it would run a sane Linux distribution out of the box (from what I'm reading, it's a bit touch and go,) and I don't consider a computer usable unless it can run the setup I need, which depends heavily on Linux -- developing on Mac OS X and deploying to Linux never worked for me: I could never keep a "sane" environment with the former.