440 source ductile adjustable rocker arms.

They are chinese. Whether or not they are junk, i dont know. If I had a mild solid cam, I'd try em. They are the only new ductiles I know of.
Ebay or speedmaster aluminum rollers are probably findable for less than the 440 source ductile. I think I'd rather have the ductiles.
The mancini's are a good option in my opinion, because they dont have roller bearings on the shaft. Fewer parts to go wrong.