I had bad luck with them. I broke two and took out two pushrods. The rocker broke at the base of the trunion. This made me even more curious about the part since I had a failure I checked out a brand new set and found that the roller tips on most of them were improperly machined and didn't align flat on the tip of the valve. I figured if I continued to run them I would either cause more carnage from broken parts under the valve cover or the increased side loading from the tip being machined incorrectly would cause premature valve guide wear. Comp, Crane, Crower all make good stuff. It's more money but worth not breaking stuff and having to redo work.
I have run GM self aligned rollers rockers (1.6 ratio) on two engines and never had a problem with them. One engine (ZZ4) had over 2600 passes down the drag strip without a failure. I think the GM ones are actually made by Crane.