It is a lottery in my experience Gene, could be either and you don't know what has been changed since. People do bag the alloy PBR's too but the only problem i've ever had with them is lack of maintenance, so siezed/stripped bleed valve or buggered slide rubbers and lack of lubrication on the slides. Once they were overhauled and regularly maintained worked fine for years - I had them on my LX when I upgraded to A9X brakes and couldn't be bothered machining Girlock caliper carriers to fit.