I shot 450 rounds with this scope on my 15/22 and it performed fantastically until the scope ring screws started to vibrate loose, then the groups opened up. :-) I didn't want to loctite them until the scope had proven itself. It has locking collars on focus, windage, and elevation. The reticle brightness knob is tight and has positive detents. If the battery gets low, the green color won't work because the green LED uses too much power, but the red continues to work.
The batteries that came with the unit ( they sent two ) lasted about 10 minutes apiece. This is my only concern. Battery life.
On the plus side, I was putting 3 or 4 rounds in the same hole.
I am using the 4-16X40