There's been a few threads discussing APAAS on here - use the search function. In the meantime before other experts chime in, here's an article from a few months ago from the Northwood High newspaper:
Did you plow through three fantasy novels a week when you were 12 years old, but now can’t stay focused on one textbook reading for longer than a few minutes? Do you immediately quit every hobby that you don’t ace first try? Do you just never feel smart anymore? Congratulations, you may be...
APAAS varies *widely* depending on the school site location and your teacher. Coupled with the temperament of your child, it can be amazing or the worst thing. YMMV.