My eyes aren't as good as they once were, so I have been transitioning to red dot sights more and more. I actually transformed my Glock into an Open gun and started off with a Burris Fastfire III on it. As much as I practiced, I often could not find the dot on my draw or I would lose the dot transitioning or from recoil (4 MOA may have been the cause). Nothing against the Burris, I mounted it on my S&W .22a and LOVE IT! I put this Cmore on my Glock-what a difference! Much easier to pick up, and the 8 MOA dot was much better for USPSA matches. I seriously like the rotary switch to control brightness, I have had bad experiences with sights that automatically adjust to lighting conditions. It's easy to reach and adjust by feel, good strong clicks. The glass is large, and makes for a good field of view when transitioning. I shot the USPSA Fla State match earlier this year and had a ball. The sight did great, the shooter, well...This is bright and clear. It does not obstruct your view. The 16 moa dot let me cut a ragged hole at 20 yards. Mounts easily. Best Red dot ever. Only one I will consider in future. Watch price, it is all over the place. I paid about $155.Absolutely a fantastic optic. Built like a tank, it feels like this optic could take almost anything. Easy to mount and adjust. Very simplistic dial that is easy to work for brightness. C-MORE customer services unparalleled. Highly recommend this optic. I know it’s a bit pricey but really worth every penny!I like the large glass and the click adjustable brightness settings. Recommended. Can't think of a disadvantage. Can also mount w 90 degree positioning glass close to slide top.Superb product. Putting them on all my open, unlimited, and carry optics competition guns. Easy to swap MOA modules. Beautiful, crisp dot unlike the flared or fuzzy dots seen even in high-cost alternatives. Tune your dot MOA to the type of shooting.What can I say, it's a red dot, it works fantastic. Put the dot on the target squeeze the trigger = hit the target. Open class shooters already know, this is the optic to have.Amazon was great. Because of C-more Systems Service Dept's recommendations for this sight for my gun I purchased it. Both sales and service are misleading. After getting it I called CZ Custom where I was told they made the mount. Total LIE! No one makes a mount for this sight for my pistol. Called BBB and filed a complaint. It was dropped because I didn't buy direct from C-more but instead one of their vendors. I despise LIARS and am sending this back. I advise all venders who buy these for resale send them back to C-more Systems. This company only cares about the sale of their product and could give a s*** about the customers who buy them! You cannot mount a CSR Slide Ride on a CZ75 because nobody makes the mount so it fits your pistol.Solidly built and easy to use. I got 12 MOA for Steel Challenge. Easliy changed to a 4 MOA for bulleye shooting with my rifle. Very pleased.