I like it, although I wish it was one of the newer models. I didn't "shop," at all. I was in the store looking just to get an M4 style rifle without optics. But saw this one, fell for the sales guy's story about it being an overrun from a Dept of Energy order for nuclear power plant security operators, asked to look at it and it was, like, "sonofabitch this thing is cool. I want it." On this model of the holo sight, the on/off/brightness adjustments are under the rear lens. On newer models, they are on the side of the unit, which I think is a lot more convenient, particularly with the magnifier in place.
That being said, it was easy to get it all adjusted and sighted in. Fun to shoot, and has a 1 MOA dot, so it allows for relatively precise shot placement, and I used it, at range of about 65-70 yards, to put a doe in the freezer a couple weeks back...