These mounts are great. Drop on, bolt up and hold a zero. I had one on my 10/22 I built for years and loved it. I've only put 500 rounds through this rifle but it's working good so far. If I had it to do over again I'd probably get the Mediums but the high's work fine with my scope and a cheekpiece.
Pros: Easy to mount, rock solid, no lapping
Cons: Cost (but worth it)
This review was written in the old system and had content requirements that are different than reviews written today.