I've owned this scope for a few years now, and I've only zeroed it twice. Mine is mounted on a Marlin .22lr, so it doesn't get rattled around too much, but it's a good clear sight. Nice magnification, holds zero well, even through a few accidental bumps while mounted. I can't say how it would fare on a higher caliber weapon, but can't be beat for a .22 target/varmint rifle.
Pros: low price, accurate, holds true.
Cons: none that I've found
This review was written in the old system and had content requirements that are different than reviews written today.