I've been running these tires since August on my STR with 245/35R19 up front and 285/30R19 on the rear on my Forgestar F14 wheels. Sometimes I let the car sit for a few weeks without driving it, and I've noticed that they have not had any flat spotting issues that I've run into in the past. Also, they have terrific grip at both the drag strip and on a road course. They give good feedback, and only start to squeal when you are pushing them as far to the edge as they can go. They give good predictability and inspire confidence when cornering at high speeds. They don't get "greasy" when they are hot either, they continue to provide excellent grip and stability. If anyone is looking for summer only performance tires, I would definitely recommend a set of these.

 

I've been on them since mid summer and am very pleased with my choice. Of course getting off garbage Michelin Pilot Sport A/S was a big plus in any direction I chose...
The S-04s are stunning in just about every category....

Vince