My wife carries a moosehead cause she is 5' flat, and she has to use it sometimes even on 7' tables.
I on the other hand try to leave myself in possitions where I won't need the bridge at all. (I know things happen, and sometimes you have no choice) Most to the nice pool halls I play at have good bridges, so I don't carry one. And on a 7' bar table I never need one.
So nope I don't carry one with me.
A lot of people say the brass bridge heads will ding your shaft, and I guess if you slam it into the bridge that is possible, but they are normally nice smooth rounded corners, and they glide a lot better than plastic.
So to tell you the truth I prefer the regular old style brass bridge.
It's not for everyone though.