Wow... I can just imagine a horse panicking and really hurting itself in there... What about getting your legs smashed on the sides? I would never tie up a green horse to saddle and ride him for the first time either..
I watched the vid on there site. The pore horse was scare to be put in that thing, then once he was in it he was very jumpy. I just see a contraption that's for people to lazy to brake a horse the right way.