let me relate my experience -
i bought sr1 firsts and whatever the name of the seconds are in about april. (ok, the thurs before barry 'went away' on monday...) anyway, the firsts wouldn't hold against a cave fill. they would lose gas out the seconds, the spg swivel, etc, so hard that they would chatter like one of those water-jet type sprinklers, until the pressure was about 3k and then be fine.
i thought the problem was probably the firsts, but i think i was one of the first to tell dwain & he wasn't sure what was going on. plus i was very truthful about having no experience whatsoever with regs. he replaced, but with more sr1s.
about 6 weeks later, i had continued to have problems, was back in the neighborhood, & took them back again. this time he'd seen some others have similar difficulties & was pretty sure it was a bad batch of springs. he traded them up to sr2s.
i would of course been happy with a fix or a replacement with ones with proper springs, and was more than satisfied with the upgrade for the trouble of bringing them back several times.
i really like them. ok, except for the orange part. i wish there was a color choice. i, of course, would choose pink.