I use one (Mark 8 IMS) on my CQBSS, and it's a good mount. I wouldn't put it anywhere near what their MSRP pricing says it's worth, but stands right up there with my Nightforce Unimouint or Badger one piece mounts. The advantage it had and why I used it is its sleek profile to not block turrets, while giving me the additional forward cantilever necessary for a 1.1-8x on a AR15 that isn't found on other mounts.