Mine have worked out fine so far. They have the same bearing as the Harland's (at least mine do). With that said I think it helps to pay attention to the shaft size. Harland uses an .875 shaft and when I found the specs on the bearing it is made for an .875 shaft. I run mine with Smith Bro adjusters and a hardened .875 shaft made from Thompson rod.

The ratio is off but at least they are consistent (1.7>1.655). They were also spot on for valve tip placement on my 906 heads.

I had a store credit with KMJ and took the money and bought some of the non bearing aluminum rockers and I have to say they do not look bad at all. I would still change out the adjusters. When I mocked them up they will require shorter pushrods, which they told me was some feed back they got on some of the sets they have sold. I bought them as I have in my mind at some point I may try the Comp .650 cam and with my 1.65 rockers my p2v clearance isn't going to happen.