I've been waiting for the Mac version of BIAB 2012 for a month or so.
I started with BIAB on PC many years ago before Logic was bought by Apple.
My impression of the relative quality of the PC and Mac versions of BIAB is making me hesitate even further.
It seems from outside like the software engineering practises at pgmusic are a bit backward.
Until I see some positive comments from Mac BIAB users, I'll probably be keeping my $ to myself.