I had the chance to try one a couple weeks ago...my nephew has one on his Larue OBR. It is mounted on an angle just right of the Vortex Viper PST so you have to turn the rifle a little to see it. It didn't work too good for me. I found that I had to really lower my head to see the dot. The dot seemed way too bright. It was in the middle of the day and had it been in low light conditions it would have knocked out my vision. I didn't mess with or ask if it could be dimmed, maybe it can be turned down on the brightness. It was so hard to find a good sight picture that I didn't care, I wouldn't use it anyway. Based on what I saw having one on a rifle and in my hands I would not buy one. Suggest you take a good look at one in person before you buy. I am sure it is high quality but again, it just didnt work for me. I did ask my nephew when I first looked and saw no dot if it needed to be turned on. His comment was that "it's not adjusted for your eye." I think he knows there is a problem getting a good sight picture with it, but he dont want to admit it because it cost alot. It was small and low iin profile so it wouldn't snag up on much, maybe that is worth the difficult sight picture. Definately look at one mounted on a gun if at all possible before you order. Good luck.