Well i did use it on her, but she didn't blow out when i tighten it so when she was trotting/cantering it started to slide back, so i just took it off. But after she got her sillies out, i put it back on and it seemed to stay in place.
I can't comment on anything else about it because she just wore it once.
But i am going to use it when i do lunge her and stuff. I feel it was worth the $20.00
I would advise you against getting the caveson though. It's a waste of money.