GGG did a great job with this QD base. It's lightweight and low profile. Mounted to the Ultimak on my M1A, it allows me to set up the rifle with either a CompM3 for low light/night or a Burris Scout (mounted on the GGG QD Base).
Pros: Low profile, lightweight, in spec
Cons: None come to mind
This review was written in the old system and had content requirements that are different than reviews written today.