Actually the key changes are what make it interesting to me. i'm not sure why it's been ignored to this extent (even listed among chopin's worst pieces rather often). Though it seems very unpianistic (weirdly enough to be chopin, the way the hands cramp up in certain parts reminds me of schumann).
the left hand has these constant eighth notes, but often the lowest is far away from the others, making the hand having to jump in certain measures. also, it really taxes the fourth finger of the hand sometimes, making finger independence very important. the coda is really annoying, as the right hand has to keep the eights going while accompanying itself with the thumb. at the same time the left is jumping octaves up and down for what seems an eternity. it seems odd that many list this as being intermediate.
there is no recording i really like of it (didnt hear rubinstein or cortot, though they recorded it). most new ones i hear are overpedalled. maybe i can post my version of it once i manage to record it.