I might buy it just because the TTS-1 is included and could use it as VST for BB.
I tried Sonar Producer and frankly it was too mind-bogging for me, even exporting a midi track as audio, required a ridicolous amount of work.

Still, for the price Music Maker 5 seems very well specified... I don't think it's a bad buy. I am using an old version of Cubase LE, probably not even as well specified as MM5