I have a full-size polymer frame Carry Comp (SKU 14415) and a Shield Plus Carry Comp (SKU 13990). I like them both, but was disappointed with the Shield Plus when I got it. The trigger was gritty and came with a non-rounded striker block. S&W sent a replacement block and with a little polishing, all is well now.
I have a CT RAD Micro green dot on the Shield Plus – direct mount and no issues.
I have a CT RAD green dot on the full-size – mounted with the #5 CORE plate, also no issues. I had an OLIGHT previously that I mount on it occasionally.