For me the solo feature is what I enjoy. Put in a complicated song and choose the solo feature. I've learned many licks from it. I also enjoy the fours feature. It's quite a challenge trying to out play the BIAB sax solo especially on up-tempo jazz standards.

Folks who want to learn to improvise are missing out if they don't have BIAB. If the solo is to fast, slow it down, print out the solo if you can read music. It's an excellent tool for improving your solos; I don't care what caliber musician you are.
Any tune, any tempo, any chord changes, it doesn't matter to BIAB it creates excellent note choices and scales for the solo to fit the chord. I didn't care for the solo feature on Jammer Pro.