I logged over 800 miles in the original Kinvara's, so it was time for an upgrade.  The Kinvara 3 does not disappoint. I typically run 35+ mile weeks, but have been running 50+ mile weeks as part of marathon training and these shoes have been fantastic.  I need room in the toebox and have a normal arch.  Definitely consider going up at least a full size from normal shoes when buying these.  I'd read other reviews of the Kinvara 3 in which wearers complained about the shoe being high at the heel/ankle and hurting the skin there.  I've never had any such problem and have already logged over 100 miles in these shoes.  I wear Experia or Balega running socks, which pair great with these shoes.