Just got an email saying the wheels are shipping. That was faster than I was expecting, but that's nice. Should be able to get those mounted and ready for Spring before Spring actually gets here.Took the Blackwing out for a drive this weekend, and I'm still impressed with the A/S 4's, but I don't think the PS4S's are going anywhere.
The last car I did this comparison with was my ND Miata. Came with Bridgestone S001 Summer tires... which were kind of crap. I put Continental DWS 06 all seasons on it, and never felt the need to take them back off. They lost some turn-in response over the Bridgestones, but actually felt to me like they had more overall grip. That may have been because the Bridgestones had a very sharp falloff at the edge of traction, and the Continentals were much more progressive.
For the Cadillac I'm comparing two tires from the same manufacturer, both considered best in class, so I guess it's not too surprising there's a more noticeable difference between them. The PS4S's definitely have more grip once they're warmed up... but obviously that's nearly impossible to do right now. The A/S 4's are consient at all times, though lack the limit grip of a warmed-up set of PS4S's. Turn-in response actually feels pretty similar. Ride quality and road noise seem pretty similar as well.
Anyway, that's a long-winded way of saying I'm going hunting for an OEM set of tech bronze wheels, as I do feel I'm going to want the PS4S's back on the car come April.