The ductile rockers work really well - I had a friend with a set done by RAU (the full treatment - bushings, narrowing, their new chromed/grooved shafts, hold downs). They were done when promised and the price was over $500 for everything. They looked nice out of the box, the shimming as supplied didn't line up with the valve stems very well. The rocker bodies weren't narrowed consistently (could measure 0.020-0.030" differences between them), so every location requires a unique shim configuration. Anyways, my friend ended up buying a whole set of shims and resetting them all.

After some run time, there was some glitter coming out of the valve train, pulled the rockers off, and there were some sharp edges/burrs on various rockers that were digging into the shims. Took them all off, faced the rocker sides on sandpaper, cleaned them thoroughly, so far so good.

There really isn't another company that does this, so you have to take the good with the bad... If you get them done, plan on checking your spacing setup and check everything for sharp edges. It's disappointing, but then again, it seems to be the norm with everything in this hobby these days.