Hnngh, every year or two I pick up Vers la flamme for a few weeks (I think I was asking about it last year on here, even), then eventually drop it as I make little progress. I just can't get those tremolos or leaps at the end, and I think I'd wreck my wrist trying to practice it a lot. I'm not satisfied with the sound from 'cheating' the tremolos; right now I'm trying to do them as written and then jump back down for two-handed 1-3 trills (rather than hand over hand e.g. in Horowitz, or just LH everywhere like most others). I make very little progress on them, and my accuracy on the leaps gets stuck pretty quick.
Any pieces like that for you?