Things I liked: I had a problem with my scope rings/mounts walking on the dovetail on my Marlin Model 60, semi-automatic 22 rifle. I tried three different sets of rings and all failed. A friend of mine sent me a link for this scope mount. For the money, I thought "Why not?" IT SOLVED MY PROBLEM!!! Since I've had it on my Marlin, I've shot approximately 400 rounds and have not had to re-zero the scope, nor has the mount walked on the dovetail. EXCELLENT product. I would recommend this to anyone that has a semi-automatic 22 with a dovetail.
Things I would have changed: Maybe put one more set screw for the "just in case" scenario.