Anyone actually using one?
Not at the moment. When they first came out I put a 3-9X rimfire version on a light 10/22 I put together. Carbon-fiber barrel, hogue stock, Jard 1-lb trigger assembly, and mounted the Leupold in Talleys. That was the only Leupold I've had that I just couldn't get functioning correctly. I couldn't get both the target and the crosshairs in focus at the same time so after a couple months fighting with it off and on I punted it.
Tom