Overall, great rings for $6. Only issue I had was that the clamp screws would loosen after a couple hundred shots (.22lr). Just make sure to check those often, and then put a little bit of threadlock on the ring screws, you'll be fine.
Pros: Solid, no issues with construction
Cons: Rail clamp screws can come loose
This review was written in the old system and had content requirements that are different than reviews written today.