The 223 cartridge died intermittently, even after a battery replacement. None of the units were quite as accurate as I would heve expected. It looks like they can be adjusted to a known accurate scope mount after the gun is sighted in, but I just live with about 10 MOA off to start a new mount job out.
Pros: Handy carrying case, came with batteries, easy to use
Cons: one of the laser units kept dying, even after a battery change, none of the units have been as accurate as expected
This review was written in the old system and had content requirements that are different than reviews written today.