When I worked in musical instrument retail (ten-plus years ago), we were a Generalmusic dealer. At that time, Generalmusic had a couple of digital pianos called (for real) Pro 1 and Pro 2. I loved these things. They had something that nobody else had, which was physical modeling of undamped strings. That is, you could hold very gently hold down some lower notes, so that they made no sound, and then pound a staccato chord several octaves above, and the harmonics of the lower notes (that you're still holding) would ring, like a real piano. Due to this capability, the instrument's polyphony was ridiculous (like 128 notes). It was an amazing thing at the time.
Generalmusic is now called GEM, and it looks like they do the same thing now. I don't know if Roland, Kawaii, etc. have caught up to Generalmusic's sample/model hybrid approach ten years later. If so, great. But if I didn't have an acoustic piano, I'd get a GEM in a heartbeat.