I'm doing OCR Additional Maths. I personally find it enjoyable but some people in my class are struggling. I'm really glad I'm doing it though, because I'm doing Further Maths so I'll be sitting AS and A2 Maths next year, and looking at the spec, a lot of the AS has already been covered.
The only thing that annoys me is that there's no A* grade. This would be absolutely fine if it was well known, but I don't think it is, so people will view a B in Add Maths as worse than it really is. So I really want to get the A so that doesn't matter so much.