They are awesome, but be sure to use proper torque specs, and a real inch-pound torque wrench on the rings. Mine used to pop screws, till I realized that even 5 inch-pounds over the limit (which, compared to other rings was a very light torque spec) was what was causing my cap screws to break. So, I backed them off to the proper (recommended by DNZ) torque specs, and no more issues.
So, the moral of the story...Always follow manufacturer's torque specs and use a torque wrench on the DNZ products, and you should have no problems.
Also, when the screws kept breaking, I had to order more from DNZ, and a new rear ring cap, because one of the screws stripped, and I had to drill it out to keep from ruining the base. Scope caps were ALOT cheaper than whole new mount. So, I placed my order online, and then called them to get torque specs and the lady was super nice and asked what had happened, so I told her my issue, and she said she would relay the message to her husband (who was the guy who designed and machines all their stuff (they're a small operation), and she was just really nice. When my package arrived, she had sent me a whole pack of screws (I ordered 4 screws, she sent a pack of like 30), and a new set of ring caps (I only ordered 1 cap), and a hand-written note saying thank you for buying their product and that they hoped I didn't have any other problems with the stuff, and if I did, to let them know.
That's customer service right there!