I got one of Dr. C's first draft horse versions. They work really well. Some horses don't like bits - you could have hands as soft as a lamb's butt and it's not going to matter - they don't want a bit in their mouth. So bitless is a good way to go.
My horse just recently went back into the bit - not idea why he changed his mind but he did and is working fine. I'm sure he'll let me know when/if he wants to go back.