I wouldn't trust anything that is under apple's hands and supervision (and generally most things that use a bsd license reek badly to me, but that's just a personal preference). Could be great software for all I care, but evil people have already achieved greatness in the past, that didn't cancel out their evilness though.
Still, ideally you should code against a standard, not against a compiler, just as you should design web pages against a standard and not against a browser.
I don't trust anything that the BSDaleks promote. That's before we even get to Apple.