I am getting close to the 2,000 round mark with my G17 MOS. This is meant as the gamer gun complement to my EDC G19 w/RMR. The gun itself so far has functioned flawlessly and I have no doubt it will make the 2,000 round torture test. What I am not happy with is the Vortex Viper optic. Besides the fact that the dot won't stay zero'd without locking the locking screws, which to get at you have to take the slide off. Today I noticed another issue. When shooting in a very bright low in the sky sun this morning something happened that I haven't experienced before. The dot was still there, but the whole left hand side of my screen had a red lattice pattern on it. This was about 9 oclock in the morning and we were mainly facing East so the sun was low and off to my right front. I got out my carry 19 and the RMR showed no such image. By the time we left the range at 11 the sun had moved enough that it wasn't an issue anymore. So while I am happy with my 17 MOS, this Vortex MRDS is getting on my last nerve. It might be time to switch to the Leupold.