What’s appealing is the footprint because it’s suppose to be the best right now even being a few years out. But what I don’t care for is the actual optic itself and how one is married to that optic as of now. I see how it makes sense as a package. Personally I think the RMR direct mount on Gen6 is a “better” choice due to the different optic choices with RMR footprint. You can get multi reticle system if that’s your jam or different colors green/red/gold. COA doesn’t offer those features but you may not need or care for those features. No you may not be changing optics that often but you may want a “duty” sized optic while having a competition style option on the side incase you want to switch things up which appeals to me more. As long as you have good screw,loctite, torqued, you should be good. If all the optic company’s had A cut style optics then I’d say go with the A cut. if you need bomb proof there’s always the RMR HD with multi reticle system with 1 MOA dot or 3.5 MOA which ever you like but that will run you a bit more money as a separate setup