Can someone explain what type of horse would work well in a no hit bit? I'm not the greatest with bits, but I'm curious about these and what they do. 

bump, anyone? just wondering what the mechanics are in this bit. I see they have a hundred different mouthpieces. 

Here is an old discussion on it:

http://forums.barrelhorseworld.com/forum/forums/thread-view.asp?tid=469719&start=1

I think the mouth piece will depend on what fits your hands and your horse is responsive to.