So a couple of years ago there was the shank fit problem with the 525SS that was supposedly resolved.
This leak problem is either the result of some design and/or production change - or it has been a latent defect since...maybe forever. My own experience aside, I can't get a read from what's been posted so far how far back this goes.
One source says it's 6K units at one distributor, another says there'll all over the country - but doesn't say "All of them are bad". Inconclusive.
I have no reason to believe a working 525SS would suddenly become an unrepairable basket case. Worst case a new o-ring or two should fix any problem that pops up over time - because that's pretty much the only thing that can age-out on these faucets.
So if anyone happens to deal with Perlick, just ask them if the entire production of 525SS faucets has this problem lurking under the bonnet...