Nah, the MacBook is okay, just be careful:
The built in card isnt patched for injection but it scans with a MUCH broader range than my USB ralink based card. I have a screen shot showing them both running airodump and the Airport card shows many more AP's than the WUSB54GC i use for injection.
i have a macbook and Back|Track ver2 beta worked perfectly on it. Just put in the cd and hold the alt key at boot, and choose the disc labeled "windows"
Back|Track2 final did not work on my MacBook sadly, it was effected by the duplicate keystroke problem. I have the latest rev of the MacBook c2duo "white"
The soundcard works great, unlike in Ubuntu,
The screen resolution is easily fixable with 915resolution
The USb works, the Battery Monitor works.. it's fine, just steer clear from BT2 "final" - trev
EDIT oops, the drivers for it are here: zombie.el.cx/bbs/index.php?topic=83.0
(depending on your revision, this is for the newest one)
The touchpad works great if you just lower the sensativity. -