Can't speak to durability, but this shoe fits me better than the Gel Challenger 10 did.  It must run to the narrow side, as I do have more narrow feet, but cannot wear a true "narrow". Also the heel fits better.  I think this is because the shoe runs just a tad "shorter" than the same size in the Gel Challenger 10.  I'm delighted.  If I could afford it, I'd buy the black pair too.  I bought the white pair and this blue pair.  I played in the blue pair for the first time last week and they felt great.