Aside from the vision issue, it seems like a bad idea to me to swap from a proven carbine optic like the aimpoint, to a less rugged one like the RMR. Saves a couple ounces, maybe? I have some T2's that i need to mount up, maybe they will take care of the dot crispness, and give you the ruggedness we're used to.
Does anyone think the RMR us as rugged as the T1? I'm actually tempted to go back to my CompM3's...