I ended up getting the 13.5 and I have nothing but good things to say about it. For the 200yard and in matches it is a dream. It's fast and with the armalite comp it barely moves. Also, I am only shooting 55grain with great results. I shot out to 500 with 55gr and was able to ring the steel.With a Burris Mtac, at a 200yard zero, I am splitting dots for holdovers. But, it is working so well I don't want to change a thing.