Hi Bill,
they actually have 2 versions, the more expensive version of the real tracks is supposedly better quality, same styles but they use uncompressed wav files. Wonder what they use for their demo's.

With the Real Drum tracks, I believe I read somewhere a long time ago,that you could even do your own real drum tracks for use in BIAB. Never tried it as I only have the 1 cd of drum loops.Plus it was prior to them using the elastique function ( don't know if that would make any difference ,anyway?), just sounded a bit too complicated at the time.
Be interesting to see if it could still be done & whether the process has been simplified.