I was very leery of MIDI because there is so much awful MIDI music out there! So, generally, I always use BIAB for RealTracks only. But, I recently purchased GPO4 and Addictive Keys and, for piano at least, I am absolutely blown away at what I can do! I still cannot get BIAB to work consistently (maybe it's me) with these plugs but the couple of times things have worked it has been amazing!