Renault
(235/35 R19 W) on
mostly country roads
for 700
spirited miles
I have already used them for 1000km on dry and wet (fast driving - b roads).
Compared to my previous rubber (potenza RE 050A), it is a totally different experience. In terms of outright grip, ps4s' are noticeably better in the dry and much much better in the wet. They are much better in terms of ride quality and comfort too..
BUT, bridgestones are definitely better when it comes to dynamic abilities, such as feedback , turn in, steering response and linearity to your inputs under pressure (above 8/10 ) even though comfort is suffering on bad surfaces.
Michelin hasn't solved the "soft sidewall issue" of pss even though ps4s has been improved just a little bit. On the other hand, due to the sidewall deformation (variable patch technology etc) they provide such tremendous grip almost everywhere. You can't have it all...
In conclusion: Ps4s for top grip and ride comfort - Bridgestones for max driver’s pleasure, especially if he loves “off balance†driving.