i did an AS level in law, as the school didnt do a full A level, but i didnt really enjoy it, i found the lessons really boring and not interesting at all, as i thought they would be. this may have something to do with the teacher though as he was the other side of the country and we we're taught through a webcam.
Depends .... why do you want to take it? It will not be an advantage necessarily to study law at A level if you want to read it at Uni. In fact, you are better off taking a range of more traditional subjects - particularly history or english, a science. So it depends on what your career plans are; I would say consider what you will NOT be taking as a consequence of making it one of your choices. Don't shut any doors unneccessarily.