I have the M&P CORE with the RMR mounted on mine. I bought this gun so I would not have to send one of my other guns out to have the gunsmith work. Also picked up a KKM 9mm barrel for it. The gun shoots great.
Already have a M&P CORE with RM07 for the home gun. Now looking to modify the 9C with RM07 for my carry.
Chris got it 100% correct. It's an eye thing for me. I don't usually wear my glasses when I am out an about. I am far sighted. I have tried the bifocal thing and it is a none starter.