Cambridge is hectic but brilliant. I love studying here, and the quality of my teaching has so far genuinely been exactly how I hoped when I applied. All my supervisors have been great and there have been one or two who have genuinely been hugely inspiring.
There's an enormous variety of things to do every night, so many clubs you can join, and so many genuinely interesting people from all over the world. However, when you combine a reasonably busy social life and keeping up with work with having extremely short eight week terms, it's not surprising that it can sometimes be a bit overwhelming. Week 5 of every term is infamous for being difficult, and I've been told exam term is very intense. There has been the odd day here and there when I feel as though the system is designed to make me feel stupid.
But I wouldn't change it. I think being stressed makes me push myself and do better. And I should point out that I've always felt that student welfare is really important to my college and that I have people to turn to if I ever had serious problems. I've heard not great things about pastoral care at other colleges, though. And I do know a few people in my year have chosen to degrade because the stress got to them.
Agree that college choice does affect what your experience is like - but, at the same time, almost everyone seems to end up loving their own college anyway.
In short, can't recommend it enough but prepare to be exhausted by the end of term.