I tried out a Parelli hackamore on Pro today. We went up the mountain and on the highways and it is much better then just the halter and lead, because the safety snap on the lead makes all the pressure uneven on his little face. I'm going to buy it off my instructor because I like it so much and so does Pro.
She also had 3 of Stacy Westfall's halters, I bought the raspberry color one off her. I really like it the little swirly things on the nose band are really good pressure points. It's much prettier then Parelli's and the knots aren't really big like Clinton's.