Company : Delivery and service was good as usual so A+ on that. Exteriour : The comp has excellent contour machining and surface treatment. Aesthetics is superb. Mounting the comp on my AR10 16" is not difficult. They have identical symmetric sides so you can choose brand marking top side or below of your barrel. View the PA video before mounting anything. Usage : Enhanced recoil reduction compared to my previous PA M4-72 .308 compensator is only slightly noticable. But where this comp shines is the lack of back blast and concussion effect because of its better degree of direction of the baffles. This makes this comp better and faster to use in follow up shots. Now I am able to continuously look to the target without flinching. Also muzzle flash has dramatically decreased. These factors make it a better comp. It is expensive but this is the best one at this moment.