rtucker55
I find the entire upgrade thing totally confusing from their descriptions of what you get.
No argument here. Their upgrade information page is pretty confusing; I decided to upgrade my BIAB 2014 Pro to 2015 MegaPAK, but it's not clear whether or not I need the 2014 MegaPAK to do this or not. Their support is pretty good though, so I've sent them an email requesting some clarification.
As to the s/w, now that I've scratched the surface I've got a better idea on what its capabilities are. There seems to be a very strong leaning towards C&W and Jazz music. If you're looking for anything remotely heavy (rock, metal etc.), you're going to be disappointed. It's a bit buggy, for example I've found one bug which was reported back in 2012 on PG's forums; you can't correctly change a drum kit's style as the previous style keeps playing. So, somewhat disappointing that they apparently let issues slide for years without addressing them.
The realtracks are far superior to MIDI based styles, and unless you buy one of the more expensive, complete packages you are not going to get many of those.
However, as a means to quickly generate a backing track to practice along with, in a great many styles and any chord progression you want, it's ideal. I wouldn't call it a composition tool though.