Yeah, no, PMC looks really shady. Whenever I buy tires I tell buddy specifically that I want something made within the last 12-18 months, otherwise don't bother. Only have had Cambodian Tire turn their nose up at my request.
If I remember correctly PMC sent Blueprint a tire and wheel set up that did not meet load specs of the CX90 PHEV. Really makes me want to stay away from them.
On about page 11 of this thread
https://www.autos.ca/forum/index.php?topic=121073.200
They did, but getting early tech info on the CX-90 was tough, even with me going through Mazda (the aftermarket - except for Amazon's Chinese suppliers - doesn't even have floor mats for the thing). They did good on their promise at least and took the whole set back, with shipping, at no cost to me.
As for the teenage tires, if the old Ouback does not see sustained highway speeds, and just putters around town, might as well keep them. I'd never take them above 80-90 though. Had a friend suffer a blowout on no-wear 11 y.o. tires on an eldery parent's little-used car, but that's with 11 year of sunlight exposure though.
For the sake of $200 difference when compared to brand new tires shipped to your door?
The difference is more like $450 with these, it's so tempting, but I can't do it, gonna sent them back
It warmed up a bit and I had a better look at them to see if I wanted to mount them and compared them to other tires I have, some near the same age....they are hard like hockey pucks. Harder than any old tires I have, very much harder than new tires (I was just at CanadianTire and checked), they are almost plastic-like.
We do drive this car a fair amount and it does see occasional 401 usage, usually full of dogs too. It's not that I'm scared they'll blow out, I just don't think they'll have much grip and will possibly also chunk in the summer.