I just purchased this sight and I have to say, it is awesome. I put it on a S&W 22a and it has held zero just fine for me. Right now, I seem to prefer to green for daytime shooting and the red for more low light conditions. The issue that some people have had about the sight failing to work after a few rounds seems like the same issue that I had at first. Like most people, I mounted this sight and started shooting. After about 30 rounds the sight would fail to work on the "3" setting in red or green but worked just fine on "1" or "2". All I did was tighten the battery cover (which was loose from the factory) and now it works fine no matter what. Simple fix. Buy this sight and happy shooting.
Pros: Works great
This review was written in the old system and had content requirements that are different than reviews written today.