The one I played with was great. It was very clear and the reticle didn't have that haze that some optics get so it was great for lowlight. I think it self adjusted for lighting conditions. For other regular illuminated scopes I've used, it seems there is reflection on the inside of the tube and also if you don't use the right light setting it starts bouncing around on the optics....I don't remember seeing any of that on the ACOG. Also, you can get a long picatinny and there is night vision that mates to the front of the ACOG that works great.