Product review (4 stars): I can hit what I'm shooting at just fine, and that's the whole point of having a ...
Works well.  I put it on a Ruger 10/22.  I was expecting a little smaller dot, so I knocked off one star.  The dot is indeed quite small when set on 3 or 4 light power setting, but you can only use those low settings when it's dark.  The minimum dot size for daytime use is larger than I prefer.  Nevertheless, I can hit what I'm shooting at just fine, and that's the whole point of having a sight.  I never was able to get my iron sights set where I could hit anything.  It's very nice now to be able to hit what I'm shooting at.  If this lasts me several years, I'll be quite happy.