Vortex is a very popular option, mine flew apart, and they had a brand new one to me in a hurry. I like a bigger dot rather than small for competition purposes. A 6moa dot only covers 1.5 inches at 25 yards, so unless you need ultra precision for some reason, a bigger dot will be easier to keep track of as the slide goes through its cycle. I have a jpoint 8 moa and the dot seems to only leave the glass as the farthest back point in the cycle. Then reappears in the glass before full battery. I'm not sure if this is the actual case or not because we're taking about such a small amount of time, but I feel like I pick it up sooner than a 1.5 on the same platform.