Pretty good but..
The app is pretty good, but I had hoped to see the lessons organized by levels/iyagi etc. and that when we download the lesson that the PDF comes with it as well for offline use. I really like TTMIKs lessons though, the teachers are great and learning is easy. TTMIK is jjang, but the app needs some more developing.
Marshiroo about
TTMIK, v1.6.1