Hi all! I'm considering trying a bitless bridle - and am wondering a few things! What are your thoughts on this: What level of control do they provide? Is this something to use on a somewhat less experienced horse out on the trail? Can you use a running martingale with this bridle? How does it affect head carriage? I'd love to hear from people who use them ...before I go out and buy one it's great to get opinions from those who've used them! Thanks all!