Everyone’s different I guess. But I had PSS on the M135i and they were replaced with PS4 which were miles better in the wet and no discernible difference in the dry.Pull the other one lad, they work well for me as the side walls are stiff, much stiffer than the PS4S tbf. Lots of progression when on the limit wet and dry.
Cups 2s are in a different league but not suited for a 2 ton estate.
Edited to add, fyi the PS4 was not a replacement for the MPSS, it was the less focused of the two, if you wanted a more focused tyre you would stick with the MPSS. However the PS4 is available in smaller sizes which in my case, works out well for the M3 running 17” alloys.
On my M4 I went from PSS to Cup 2 and the Cup2 just makes it evident just how s**t the PSS are for steering feel. The car was noticeably more direct, and the wet grip is still pants, but it’s worth it for the extra communication.
Long story short. PSS are s**t and you should either go PS4 (S or otherwise) or Cup 2 if you want Michelin. PSS aren’t even the cheapest.