Digital pianos have physical limits you cant deal with- I cant play Liszt, Rachmaninoff, or Scriabin on a digital! You need aftertouch in many cases and sensitive pedaling to play well. digitals are a lot of fun for kicking around, but the Grand has always been, and will continue to be KING!!
You experience true pianistic power until you play on an acousitic piano- you will feel the strings vibrating through the soundboard to the keybed, and there is nothing better than that. It's like the difference between driving a Lamborghini and a minivan.
donjuan