I know pocket operators have limitations, this is not the only one I have (well more like had because I ended up selling it).
I was expecting that this machine could produce all notes. It didn't even cross my mind that this was not a possibility. If I recall correctly the main problem was that the chords available were only a select ones. Like for example maybe Am, C, F# were available but B, Dm were not.
So to me it felt that everything ended up sounding similar too often. It was fun but just for a while.