Then GoodYear needs to decide soon and start making C6 style run-flats in the C5 size or a lot of us will ignore your previous run-flat report and buy quieter, better riding run-flats from somewhere else - like Michelin.
With 22K+ on my 03, the rears are getting close to replacement time and they are getting louder every day (just like the F1 EMTs did on our 98). I'm leaning toward the Zero Pressure Michelin tires already. I do not want to use 'regular' tires since I want the run-flat capability on any car I have that does not have a spare.
BTW, my 04 CTS-V has GoodYear F1 SuperCar tires in run-flat configuration and no spare. What is GoodYear waiting on?