I have one and I have had it on several handguns. I used it on my 454 Casull, 44 MAG, and currently it is on my S&W625. I have had no problems at all. As you turn down the brightness the dot gets smaller and easier to see your target. Indoor range shooting, I turn it down to almost the dimmest setting, but outdoor shooting it needs to be a little brighter. For hunting you can pick up your target very quick. I highly recommend them and use them. I have seen them on handguns, rifles and shotguns.
:-D