All opinions welcome. How do they work? Do they really help the horse learn to use their back? Are they user friendly especially for a horse who does not know how to move with forwardness or impulsion yet? Do they work best with a bit in use with them, or caveson only? Are there models that "bump" the horse's mouth? I have seen some where the strap that goes behind them is also attached to the lines that go to the mouth making it bump the mouth with each stride and I have seen some that attach to the surcingle separately. Is there anybody who makes up their own similar setup themselves that they think is better, and how do you set it up?
I am really interested in this equipment but as I have no knowledge or experience with them I want to learn as much about the pros, cons etc before going this direction. My current trainer doesn't use them herself, but she isn't against her students using them either if they use them correctly and if the situation wit the horse warrants it. Her trainer in Germany did use them on some green horses.
Thank you for your input.