I did OCR A and liked it - I can still remember the module numbers! 2824 was the hellishly big one, I remember that much. It was like an entire A2 textbook for one module! Yeah actually, the OCR A 2824 textbook was the same size as the OCR Chemistry A2 book! (all modules)
Oh well, I got 85/90 for that one, so it can't have been that bad.