In mostly cases I would say it works perfect, but I always recomend people to double check it, just like you should double check Everything else.
When the scope is mounted it's a really good idea to after the rifle is zeroed shoot a group at known distance, for example 100 meters/yards, then adjust the scope a for example 10 mil and shoot another group.
When shooting both groups make sure the scope is held horizontally.
After shooting second group check so the second group is excactly above the first group.
Also check so the distance betwen the two groups are excactly corresponding the adjustments you have made.
After that a boxshooting is also a good thing to check so the scope is tracking.
If you not have tested the scope under good circumstances and know it's performing, then you don't know if it will perform under stressed important circumstances.
And so far there is not one single company in the World who to 100% have avoided mondays....
There is a tolerance to the the axis movement of the knobs and there is also a tolerance to the reticles angle compared to the flat bottom of the scope or the top of the knob.
Some have very tight tolerances, other have sufficient tolerances and some have very many mondays.
Sometimes we happends to work on mondays to.....
Håkan