A bit disapointed

My first review of the app said "excellent". Now I feel like changing it for two reasons:

- First, recognition was working well for starting lessons but then itd become such a pain that I abandoned the app for a while. Pressing one note at a time works well. Getting chords recognized is near impossible for me. Each note is recognized when pressed individually but not when pressed together. I was getting so frustrated trying to achieve the exercises and thought I was doing something wrong that I asked a pianist friend of mine to try it without great success neither.
- Second, I had no problem paying a one time fee to unlock premium content two months ago. It allowed me to start learning piano at my pace. But now we have to pay even more to unlock more premium content. And this time its a monthly fee. Sorry but for this price and quality I prefer using Yousician. Thats what I tried when getting frustrated by the recognition and it works well on it.

You could have at least offered the premium account to existing clients or at the minimum offer them a few months free.

hisoka_master about Simply Piano: Learn Piano Fast, v2.2.1