The didactic concept is right on the mark, but its implementation is very poor. The"full" version has very limited scope. How can you not have conjugations for very common verbs, such as "to do", "to live", and others.
Support is very poor. When IOS8 came along, it broke the login process and only the "demo" verbs became visible. It took months to get it fixed
Centus about LearnBots Russian Verbs