They are very well made and return to nearly the same zero.
That word "nearly" kind of concerns me. I would think for the cost they would return to zero every time.
But then, I don't understand why a QDB is useful. If your hunting and your scope is broke, just take it off. Maybe I am over simplyfying it. Easy to say,....like that last time I needed to change my frizzen about a mile in the woods and I had no screwdriver....you know.....easy to say.
Dave.