So I'm going to supply a bit of a counterpoint. I've been a GNU/Linux and BSD user for a long time and use some variation natively on every computer that I own EXCEPT for my Macbook Pro. Linux and BSD on laptops has always been a boon to me (though I have had a number of laptops that have worked fairly well with Linux). OS X has the benefit of being a great out of the box Unix system, the only problem I've seen is the lack of customization allowed (though it's not as extreme as I would imagine).