I have a Leupold scope on every rifle I own, that I want a scope on. I have only had one issue ever and it was my fault and they fixed it for free. My friend has a ziess concuest on his main deer gun and I have to say it does seem to gather light better. I don't hunt in the dark, so the small increase is not an issue.

However the conquest is heavier and larger and that counts for a lot to me. The Leupolds track well, and POI changes precisely when adjusting them.