Apex AP class over the summer?

Just contacted my school and they said taking an AP class through Apex would be factored into my gpa. Anyone ever done this? I would appreciate any information you have! I am basically taking this just to bring up my weighted GPA so if you have taken any please let me the difficulty, time taken, etc.
I am interested in taking 2, choosing from AP psych, micro and macroeconomics

Thank you!!!