I bought this keyboard so I could continue to practise while my regular DP was in the piano repair shop. In the beginning I just used it as a "typewriter", learning to hit the correct keys at the right time, but when I got more familiar with it, I noticed I was quite able to even focus on technique and dynamics, and it sounded much better than I had expected.
However, when I play on my regular DP, I very rarely create unintentional ghost notes, and on this keyboard, even once I had played it for a couple of weeks, there were still quite a few. Without the ghost notes, I would have given it five starts.