I tried my mare in a Nathe and she REALLY didn’t like it. I was kind of thinking the leather would evoke the same response, but it certainly did not.
She has gone well in a waterford and a happy mouth previously, so I think this is a similar feel for her with less bite.
It’s also very light weight and she gets a little twitchy about her ears and poll (goes best in a micklem) so I think that helps, also.
One of my students pony goes in a waterford to jump and a french link on the flat and is very defensive of any bit contact. I wouldn’t jump her in this but she went right to sitting in the contact when I worked her on the flat. Relaxed back, no tension. No “popping” up when I tried to make an adjustment.
I rode my gelding in it today, who normally goes in a happy mouth and is very soft mouthed, and he curled up and wouldn’t sit on it at all. Very interesting testing these!
I have one more soft mouthed TB who goes in a nathe that I’d like to try in it.
I do find it interesting that a waterford is not legal for dressage, but a strip of leather is.