I'm running BIAB on a Macbook pro quad 2.3GHZ with a OCZ Vertex 3, 240GB, 6gbps SSD, with Colossus as the soft syth (prefer it to even to real tracks).

Thing is, i'm running it in a virtual machine (VMware). It's as fast as native, even running Kontakt.
No sense installing Bootcamp any longer LOL.

BTW, this Vertex gives me 475 Mb/s reads and writes. (for those who may not know, a 7200 rpm WD drive gets about 110 Mb/s (at best? )

The good thing about these VM's, is that you can freeze them, shuffle them around, copy them, and save them for later.
Very convenient.