I have the design machine mro mount on mine, friend has one with the mini rmr style red dot that was a factory option. I really like the mro on it, he had a mro on his but switched it to another gun. He was saying he is going to go back to the mro as well(same mount).
There are some reviews on youtube for the design machine mounts. I personally went with the mro over the aimpoint because of price. I have multiple aimpoints and mro's and honestly the aimpoint's are better but not enough to justify the price in most cases.
FYI one of the screw points was just ever so off on mine, I think it was the gun out of spec, not the mount. I just ran a tap through with the mount installed with the other 3 screws installed and fixed it. I know the casting can be a little off too, design machine's mount is tight. I think they say if its too tight they will shave it down and refinish for free. Either way that one on mine isn't going to move. Still I like the mount and mro combo and would do it again without hesitation. An aimpoint might be a tiny bit lower but I'm happy with the mro.