I was visiting my amp tech guy to have him take a look an amp I put together and noticed he had 7 amps to repair/service 5 were fender hrd's in the line to be repaired. I inquired about that and he told me 4 are broken and one to be modded (vol control mod). He said he was probably going to end up doing the vol mod on the others too depending on the customer of course. He said he sees quite a few HRD's in for minor stuff repair wise (but still broken) but not grossly out of purportion to the number of amps in general. We have lots of HRD's floating around here in my town. It seems to me from his further comments that the HRD's do not to seem as durable as some other common modern stuff. take all that with a grain of salt, it just struck me as weird to see a row of HRD's lined up.