Actually it does release the pressure pretty well (I was also skeptical) and Lacey is the type to go completely overboard about cues (if it didn't release the pressure all the way she'd have backed all the way across the arena) but she was fine. I also tested it before I rode, pulling it tighter on her face then letting go and it didn't get super droopy loose but it got looser, which is all you basically need.
Any ideas how to make the transition easy?
Fabio - 13 year old Arabian/Lipizzan gelding
Rest peacefully, Lacey.