Works great, my first optic - Gideon Optics Rock Red Dot Reflex Sights

Got it mounted to a px-9 night stalker and it ran like a dream. Deck sits up fairly high, so you can't co-witness. Brightness variables are perfect for any situation. Tested the shake awake function multiple times. Love the large circle around the dot on a smaller window. It does in fact have the circle around the green dot, even though it was labeled 3 MOA dot on the model selection. Exactly what I wanted, but I know it confused me when ordering it.