Took it in 11th grade, got a 5 on the AP test. Great class, great teacher. My teacher was a (fairly open minded) Republican from suburban Texas who let me borrow his copy of A People's History of the United States after telling me that the DBQ I wrote about the Populists made him think I might like it, which was more or less the first step on my path to becoming a socialist.
For my class, we had to buy
A People's History of the United States and were assigned weekly readings from it. I guess I naively assumed it was part of the standard APUSH curriculum.