Pianorin...
What do I think of the concerto? Well, it is beautifully orchestrated (very colourful), the piano part is so full of character, and the counterpoint is just beautiful. Let's face it, Rach knew what he was doing!
It is a fairly difficult concerto, but I think it is Rach's easiest (other people will have different views on this).
Big hands definitely help, but they are not essential. After all, so much of playing the piano is in body movements and gestures - the only thing you might have to do is roll a few of the chords that are intended to be played solidly. (If you can't even reach an octave, then it's a different story)