I use one and am very happy with it. I gave a small one to my DD1 but she couldn't manage to insert it, so is still using disposable pads instead. (She doesn't like the idea of cloth pads.)
I have the problem that my flow is very heavy for the first couple of days, so I am frequently emptying the cup during that time, and have to wear a pad at night for the first two nights. I guess I should really get some cloth pads. I hadn't yet because I've been telling myself it was a short term abberration, but it has been over a year now. Actually, I've used a small bamboo booster from an MCN before, I think I should do that again. DD7 is out of nappies so they are just going to waste anyway.
PS: I hate disposable pads so much that I used terry flats at home instead of maternity pads.
Edit: I just realised the above PS probably removes me from the category of "normal person" with regards to the original question.