I have 2 CMores mounted on bullsye semi-autos and 2 Ultra dots mounted on bullseye guns. (It's that old story about golfers buying another club for a lower score.) Shooters just buy a different gun.
Having said all this, I like my Ultradots better than CMores, but CMores have the 'Wow Factor". A like to good prices on Ultradots:
LarrysGuns.com - Larry's Guns Inc.
The cheaper Ultradots work great; bright sun, early morning, twilight, dark clouds.
Model 25-5 go to post #4 or #5 for an Ultradot on a S&W.