What I could hear, and felt, immediately was an improvement over earlier models. I could get around on it pretty good and heard the tone and sustain was much improved.
Just to clarify: when you say "sustain," do you mean the rate at which the tone decays? One thing about the last generation of Privias that drew criticism from a lot of people (including me) was that the piano tones decayed in volume too quickly. Would you say that issue has been addressed?