i hear those tires are some of the quietest, best riding ones on the market. Not very good for performance, but sheesh, i would love to have a set for daily driving, no more flat tires!
I work at a place that deals with Michelin tires and those are the prototype. The produstion version has a sidewall and there is a performance tire line that has a stiffer rate that actually stiffens like a spring for better handling than air filled tires. Down side is they cost an arm and a leg and only a few select vendors across the country have the equptment to work on them.