I find the app quite good but for absolute beginners the first exercises are almost impossible to perform. I already used to play and have difficulties, as the successions are far too fast for me. Also the accuracy for chords at the beginning is to high as I have to play one excercise 50 times, just because the chord is not 100% correct, but maybe 95%. The slow mode is quite buggy still. This needs to improve for 5 stars.