It's been two years hunting with mine, taking the bumps in the back of the truck and then in the hands of my 15, 16, 23 y/o sons including my own, and just before this year's hunt I checked it and was still right on the money. Excellent product!
I glance at it every time I think I'm not shooting absolutely level. It's like the side to side level of the gun. You think it's level or not angled to the side but check it each time......you'll be glad you did. Only takes a few seconds.