This year I had duplex installed in an older 24x Leupold for long range hunting and am happy. The adjustments are not exactly at one MOA, but are very repeatable. One turn of the knob equils ten minutes, (as opposed to 7.5 or 15)so it is very easy to enter in a desired range adjustment, and that is very good! If I see something I want to shoot at, I use the 'both-eyes-open' method and have the easy to see hair in place very rapidly; a couple of seconds or so...