Fantastic songwriting tool!
I really love this app. I got this and the acoustic guitar version a few days ago. Ive already got strong starts on about 6 new songs inspired by the playing and demo chord progressions. Some of these may make it to the track in Sonar X2 if I decide to produce something bigger. The sounds are quite good except for a few transition effects here and there. If its mixed with other instruments, you would never notice those. Ive done a few simple demos in GarageBand using Audio Copy/paste. Audiobus works but getting it synced with GB metronome was more trouble than its worth. For a quick sketch of a new song, I just play back the loop in this app on my iPad, and record my voice and the instrument using the Voice Memo on my iPod touch. Not high quality but really quick and easy.
This app is similar in some respects to Band in a Box on PC. I have used that program for years, and in recent years its gotten really good with Real Tracks. Those are chords and riffs and other parts play by studio musicians and synced to the midi track which you defined by chord progressions very much like this app. BIAB is more flexible but also much more complicated and expensive.
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SessionBand Piano 1