I have two Burris FF III sights, with the 3 moa dot. I use them on a 9mm CZ P-09 bullseye gun and on a CZ-97 .45 bullseye gun. I think I have about 8k rounds through the P-09 with the Burris sight. No problems at all. Only 2-3k rounds through the 97 with the Burris. Again, no problems. They work great on a slide on a centerfire pistol, in my opinion. The glass isn't as perfect optically as an Ultradot, but the expense isn't as high as the other reflex sights, either. The glass doesn't cause any accuracy problems, there is just a little distortion, that's all. I have had one on a 22 as well, but use the Ultradots on the 22's and moved the Burris to the centerfire guns. I've used the Burris sights in many 100 and 200 yard demonstrations on the pistols. Good sight.
Joe