I have the 615k+ and unless you are doing a good amount of AutoX and burnouts you should be able to get good life out of them. I would be happy with 15-20k miles. I replaced my fronts last year, they had about 8000 street miles and 100 autoX runs. I could have gotten a lot more without the AutoX. The cords were starting to show on the inside edges.
Yeah they are stickier and pick up small stones and such. Have you considered putting a clear film in those areas for your paint protection?
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Chris
1968 Camaro SS
LS3/T56
Full of DSE and Holley parts
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