I see they also make a double-rein version. That's cool.
These have less severe shanks than a regular mechanical hackamore, as they are slightly shorter and also curved back. The noseband is less severe than a rope (less abrasive), but the solid-covered bikechain still gives a strong feel. The leather curb is a nice replacement for the chain, making it gentler on the horse and removing the "shanking" ability that is so awful about regular mechanical hacks--you can't grab and jerk a horse with it. Other than the above, it is just a well-balanced mechanical hackamore.