Alright, time for my AP experience because I don't feel like studying IR:
I took AP US History, English (Lit), US Government, and Art History. Our school also offered AP Calc and Physics, but I wan't in the advanced Math parth so I couldn't take them.
History - in personal experience, this was a joke class. The original teacher resigned after the first few months of school, and our new one was working on her dissertation. So she would summarize the chapters for the first 1 minutes of class, then we would play spades. Needless to say, most of the class wasn't ready for the exam. I got a 5, but pretty much only because I bought one of the guidebooks and studied on my own for it. And I'm an overall History BAMF
US GOVT - This was an interesting setup because our school was on trimesters. Because this was 08-09, they decided to offer AP Gov in the fall because of the election. Good times, even though we had to move at (what I though of at the time as) a fast pace to cover everything. An handful of us took the exam later in the spring though. I got another 5, mostly because I got the book for this one too.
English - Now this was an interesting class. We had a research paper as part of this on a book our teacher chose for us. I had The Brothers Karamazov by Dostoyevsky (read - 700+ pages of Russian literature). Not too bad after the first 200 pages of introduction though. My paper ended up being 20 pages, counting citations. Got a 4 on this exam (maybe senioritis caught up with me by then since it was my last exam for HS). Still enough for college credit for me (although they wouldn't take lower than a 5 on the first two).
Art History - This I took more as a resume/GPA booster (because yes, colleges like seeing "AP" on your transcript, and As in AP courses got you a 5.0). It was offered at a local art museum, so I had to go there for my first class everyday instead. Not too much of a workload; just sit in class looking at paintings, architecture, etc. Had to turn in some questions every chapter though :/. I ended up not taking the exam though because a) my college didn't offer credit for AP Art History (must have known about my BS...) and b) why take it when I wouldn't get credit and it was optional?