I have never ridden or trained with a bosel but I've been thinking about getting one to use on my QH, "Buster Brown." He yields very well with a halter. Any suggestions, or threads here with suggestions?
CowChick would be the best person to talk to. I have done a bit of training with a bosal (around here, pronounced either "bows-all" or "bo-sul") but I'm a long way from an expert at it as I've always preferred a snaffle then straight up to the curb. One thing I can tell you is that any good bosal will have a natural core in it, stay away from anything with a cable core, those are crap.
Also, a good bosal and hair mecate (meh-cah-tee around here
) will run you several hundred dollars. If you wanted, you can get a decent yacht rope mecate for 30-50, but they are much heavier than hair. I'm not really sure whether that's a good thing or a bad thing. I know I refuse to use a yacht mecate on a snaffle simply because it makes the bit imbalanced by having the near side weigh almost twice as much as the off side.
Anyway, all I have to say about the girl who posted all those vids is this: With the way she rides, bosals (or in her case, a very poorly fitted rope nose hack), saddles, and riding are all
cruel. My horses would kill me if I rode like that.