I have Bates Cair thing, which I think is pretty much the same idea (correct me if I'm wrong, I usually am!). Tally loves it, and his previous owner said he was incredibly hard to fit saddles to as he would buck like a maniac if it hurt. With his current saddles (a Bates Caprilli dressage one, and a Bates Caprilli flat seat jumping one, yes he's spoilt) he's brilliant!