I started on the accordion adn moved to the organ. Only later did I learn how to make sounds on the piano (I don't play like a real pianist, but I have an acceptable style) and then become proficient on arranger. Even all of these keyboards have differnt pros and cons. The one thing I appreciated learning on the accordion is the left hand - circle of fifths going up and fourths going down, thirds immediately in front. The organ helped my chording tremendously. The piano, which I truly love, helped me spread out my hands and work on bass and chords. The arranger has helped me return to the right hand, where I almost forgot how to solo.

I agree that most piano players I've met have a hard time playing anything else, as the style must change with the instrument. A lot of pianist I know READ too much. I read OK, but wish I read better; I've always been a rememberer and a player from the heart not the paper.