I looked through one mounted behind an EOTech on a tricked-out M14s. I wasn't all that impressed with the optical quality, and I really didn't like the fact that the red dot was also magnified (should have been obvious, but I never thought about it before handling the thing).
However, the twist-type quick-release mounting system was very slick. I would love to have a similar option available for a low-power scope.
John