All my MacBook Pro laptops run Mac OS X and I haven't found them any way restricting or limiting. Also I hate flimsy plastic x86 laptop HW, too: Knock the laptop a bit and the plastic breaks. Automagically adjusting keyboard backlight, magnetic power connector and cooling system that doesn't melt the laptop when used on soft surface are the small things that make the difference to me.
Before anyone jumps to any conclusions: I run Debian/GNU Linux on my servers and desktops.
