I know a couople horses that work great in them and an couple that don't. Each individual horse is different. But one mare I know is also terrified of bits and works great in it but is she having a perticularily mare-ish day the breaks don't work so well. But I'm sure that could be fixed with more training...alas not my horse so not something I have a ton of control over.
The love for a horse is just as complicated as the love for another human being...If you never love a horse, you will never understand.