Leupold Mark ARs are mounted on two of my rifles.
The Mini-14 Deluxe has the 1-4X Mark AR, and it is working perfectly. No drama, just a very good scope.
My Armalite flat-top AR15 has the 3-9X Mark AR, which has the trajectory compensator. It's very simple to use; just zero the rifle at a known distance, set the turret for that distance, and lock it. (I used 200 yards, and set the turret to read "2" after zeroing.)
ASSUMING (yeah, I know) that your load and the turret are compatible, you are good to go. MY turret says "55 grains @ 3100", and my handload in that rifle is a 55 V-Max at 3097 fps, which is surely close enough. (Leupold will supply a custom turret for just about any load, IF we know the velocity.)
All that's needed then is to set the turret for the required range, and hold dead-on. Out to 500 yards, as far as I've tested it, the outfit gives 100%-reliable hits on a steel IPSC silhouette..... with that dead-center sight picture.
Both Mark ARs represent very good value in my estimation.
I added an extended bolt handle on the Armalite, as well as an ambidextrous safety.... being a left-hander. The handle is a very useful addition, and makes it much easier for ME to retract the bolt when needed. Others may think otherwise.