I like it.But if you should learn it, no idea. How could I ever answer that? It's an unusual piano concerto. And what about his other two?
My only copy of the score is the real, physical, sheet music. I bought it at Hutchins and Rea (https://www.hutchinsandrea.com). It's published by Breitkopf and Hartel and I think it cost me $36.95.