My wife and I were shooting carbines this afternoon. With her glasses, as co pared to contacts, she found both a T1 and T2 to be very misshaped, and enough so, it negatively impacted her ability to shoot small groups at 50 and beyond (which normally is easy for her). She then tried the RMR on my Benelli, and saw a very nice shaped dot.
While not as rugged as a T1/2, makes me want to mess with a RMR some on a carbine.