So these drives arrived a week or 10 days ago, I just now had time to drop one into a bay to check it out.
~225TB written, one single ECC correction, 2 grown errors and ~3.5 years run-time. The rest of my bays are full of HDDs running badblocks but I'll pop a second in in a bit and see if the wear is similar. All of the drives in this batch came with 2013 mfgr dates except one from 2011.
Drives ship with 528b sectors, I ended up running
ahouston/setblocksize against them to reformat to 512b
Edit: second drive only had 2.6TB written
Third drive ~225TB written, zero defects.
Edit: Three drives with ~220TBW, two drives with ~440TBW, one drive that furiously remapped sectors during a badblocks run.
Performance is meh given the power required, oh well at least they're durable as heck.