Well, the only difficulty I'm finding is keeping my technique nice and clear as I get faster and faster at it, but I just really started working seriously on this recently and it's getting better every day so I can't say I've hit a "wall" yet. The trickiest bit for me would be the bars with the left hand tremolo and the right hand sixteenths marked piano that leads up to the right hand trills. I don't have a problem with the trills, but I'm finding it hard to keep the hands together, but it's always improving.
And sadly, I'm aiming to take my last exam only a year and a half after this one, so no, I don't want to spend a long time at it. I've been listening to other sonatas, and well, I'll probably get in trouble for saying this, but they strike me as rather boring. I mean, individual movements are good, but when I think, "Am I going to enjoy playing this whole thing for the next year and a half," I'm not left with much. I haven't listened to them all yet. Just part of that easy one in G Major, which i did the first movement of last year, but it's too easy to use for a final exam, the Moonlight, which I could use, but which might be too overplayed, the Waldenstein, which is too hard for me right now, the Pathetique which I'm already using this year and which is also too easy to be in the syllabus for the final exam, the one in Ab with the funeral march as the last movement which is easy enough sounding, but kinda of boring for my dramatic taste, and I think I listened to the Hunt, but it didn't turn me on either. But I still have alot to listen to.
Edit: I forgot, I've also heard the one in E major, which is too easy for this level (they put it on the same level as Pathetique), and the Temptest which is okay, but I don't really know if I'd want to learn it for this.