Sky isn't falling based on one opinion.
Stick with what you have read and seen.
These are new here but have proved themselves in testing and overseas before they got here
My brief drive in cool and wet temps showed to me that traction was much improved over stock run flats. Where I used to spin making turns at intersections I no longer did. Better bite and feel with these 500's.
....put the hammer down on any cold tire and it will spin and squeal in protest of sharp cornering on roads.
Maybe that is why there are no 90 degree turns or intersections on a track.