I actually have the King Armory KA-1222A on my AR. Can't even remember why I chose it - it was probably on sale.
With AR recoil being quite light as it is, taking a 46% recoil reduction, without blowing the ears off the other people on the bench, is more than adequate, IMHO. It was easy to shoulder fire and stay on target even with just the birdcage. I'll never be an A-List competitive shooter, just want something that's fun to shoot.
I wonder if, on the shoulder, I'd even notice the difference between a 40% or 60% reduction.
Not defending the purchase or schilling for King Armory - can't even remember who I bought it off. Just curious if anyone really notices much of a difference past a certain point?