I tried it Sunday morning and found it too agressive, a 8 inch curb with a Barry Allan mouthpiece.
I found I had to back the curb off 3 or 4 holes and I still found just picking the heavy reins up caused him to move his head up. I also found sliding down a slick bank that the least touch of the reins caused him to sit right down hard.
I did not like it or rather I didn't like the mechanical advantage it gave me.
I also didn't like the fact that the curb extened quite a bit below his muzzle. We will go down over the years, not if, when, we will wipe out and his muzzle will slam into the ground and I don't want to inflict any more damage then I possibley can. I seem to wipe out badly as least once a year. Once 2 saturdays in a row we did a complete head over heals whip out.
Trust me I have experience on going down.
I now own a 5 inch Bary Allan bit. I cut the shanks down 3 inches and being stainless and hand built in the first place a little tig welding, a little grinding and polishing and it is as good as new, looks stock and cuts down on the mechanical advantage. Hopefully he is less sensive to the reins