I drive a 992 Carrera 4S in the Pacific Northwest. I'm using the Porsche OEM version of this tire (N-rated). In the snow I've had no problems with grip, under normal fairly cautious driving. But that is where the benefits of this tire end for me. In the dry or damp, the handling feels unpredictable in bends in a way I've never had before, like the grip limits are far lower but it's hard to sense at what speed or how it will behave. In the wet, these are abysmal. I've had ABS kick in under just slightly harder-than-usual braking. On a slightly damp surface (a couple hours after rain), a friend with the same car but on summer tires (in 37F / 3 C weather!) did a hard 0-60 at a highway entrance without issue - I was behind him and tried the same, but got wheel spin and wheel hop as the AWD scrabbled for traction. I'll also add that the rubber on the sidewalls appears to be breaking down, the tires are 2.5 years old and have always lived indoors.
If your winter is mostly snowy, these are not bad, but if you get mild rainy winters with minimal snow, like the PNW, I'd avoid these.
If your winter is mostly snowy, these are not bad, but if you get mild rainy winters with minimal snow, like the PNW, I'd avoid these.