They are reliable, but the turrets are huge.
I like the locking turrets and in some ways prefer the 5mil/rev DMR to the 10mil/rev ERS/XRS.
The 5 mil/rev has better clicks IMHO.
Zero at 100 yards.
Draw up a target on an 8-1/2x11 sheet of paper with a dot centered near the bottom.
Add a dot level with the first dot but 3.6" to the right.
Add another dot 7.2" directly above the last dot.
Add another dot exactly level with but 7.2" to the left of the last dot you drew.
Add another dot directly below the last one and 3.6" left of the first (centered) dot.
4 dots should form the corners of a 7.2" square (exactly 2 mils @ 100 yards) with a 5th dot centered between the bottom 2 corner dots.
Hang target at 100 yards and verify zero on the bottom center dot.
Every shot will be aimed at the bottom center dot.
Fire 1 to 3 shots each after making the following corrections
1 mil right
2 mils up
2 mils left
2 mils down (back to zero elevation)
then return to zero with 1 mil right.
If you have a big piece of cardboard you can stretch it out a bit, just remember to make the dots at intervals of 3.6" to equal 1 mil @100 yards.
If using meters, 1 mil = 10 cm at 100 meters.
Joe