The treadwear number is pointless, every brand makes up their own rating for that.

Have you guys had the chance to test this tire against the Michelin pilot super sport? I'm interested in hearing what people have to say.

The Michelin stands no chance against the RE11, RE11 is a much grippier softer tire. Michelin CUp yes

We have not done a back to back testing on the same car yet. The Michelin PSS is a great tire and I believe would be another great option. We have used this tire on the GT-R with very good success. We have not used them on the 370z to date, so I can not honestly say how they compare at this time.

I have the Michelin SS' on right now with just over 5k logged on them.

Love them.

Quieter (marginally, but still every bit helps) than stockers
Cornering is on the money. Either in a tight turn, or a long right hander, the car will not budge. Even over bumps at "higher" speeds, you don't move.
Dry Traction is equal to RE-11's. I won't say between the two which is better since I have not ridden on RE-11's. But for those that say there not even close, that might be an overstatement as these have been great tires.

For the setup I currently have:

255/30/19 F 295/30/19 R, $1850 installed w. 4x lifetime warranty's from Discount Tire.

You got to be kidding yourself...

any recommendations for good websites with good prices to order tires from?

just bring the vasoline, they are all expensive

I have found same thing as Chris reports on Michelin Super Sports. Especially the cornering compared to stock.
Using stock sport size 245 front 275 rear.

I notice some guys go quite a bit wider than the stock tires. I was wondering if there were any cons or risks with going wider and how do you make sure it'll ride fine and everything? I have the sport Rays which are 245/40 and 275/35.