Oh lucky me, I was on the CIE board for my IGCSEs and A Levels in an international school in Spain. x.x;
Somehow I managed to get ABBB as you can see in my sig. >_>
But yeah, they are somewhat harder, not to mention you can't (to my knowledge) do the exams modular style, the History exam was one single 3 hour paper with 4 45-min questions, and that was it. You'd come out with one grade. If you wanted to improve it, you'd have to retake the whole exam over again. Apparently I would have got an A in English Lit but an A in CIE Eng Lit is a complete bitch to get. Not to mention they're all old fashioned on the CIE board too.
Dunno if the CIE board A Levels are what you're after though. >_>