After 30 years playing only real pianos, my immediate fear was the touch and feel, that is: the weight of the keys and the sound of the piano... both passed with a BIG OK.
I was Impressed by how the overall sound changes timbre depending on the loudness of your playing... the balance of high notes being muffled by the low tones with the increase of the volume.
Then on to what I was l expecting like a child: all the features of a robust and good looking digital piano: reverb, 500 sounds, chord modes, etc...