I have a set of stainless ones on my engine.I have just run into a problem with the adjusters loosening up. The nut would fall off and the adjuster would spin all the way up and then it would bust the cup on the adjuster.I set mine up with ball/ball pushrods. I had to order a set of harlan sharp adjusters ($170) to fix the problem. Also when i installed them on the engine i had to grind them so the rocker body wouldnt hit the valve stem instead of the roller. Other than these issues im happy with them. Im only running a cam with 540/555 lift though.