This is what I use more and more frequently for quick arrangements. I had a few titles and I recently bought the full collection (UJAM made a good discount on the grounds that I already had some titles, and they made quite an offer for the full bundle). I like the sound quality and I like that I can use the VSTs as arrangers OR as normal VST instruments that can be played note by note. If you love a MIDI drum roll or guitar riff but you want a small modification, you drag and drop the MIDI clip on your DAW track and you play the same arrangement as individual notes. Then you can edit the individual note you don't like (and at this moment the drum roll or the guitar riff is yours). The same VST can work as arranger or as a normal MIDI instrument.

There are many VSTs, but the way to use them is very similar. 7 drummers + 12 "beatmakers" (similar, but more "drumbox oriented"), 6 "finishers" (creative FXs, not instruments), 3 symphonic instruments (~ ostinato machines), 1 synth with 9 expansion packs, 5 Bassists, 6 guitar players and 3 pianists. One of the "guitarrist" have been free at times (Carbon?). So you can buy second hand for almost nothing. It's a heavy-metal oriented baritone guitar. I recommend to try it.

It does not substitute BiaB, it is a different way to get to similar results.