Colby, if you have 600 miles on those shoes, I'd say you definitely are due for a new pair! Like Yellow, I usually only get about 300 miles out of a pair of shoes. In fact, the last pair I bought has just a little over 100 miles on them and they are showing wear, so I'm about to buy a new pair and rotate the two pairs.

The last time I bought shoes the guy at the running store told me that if I could compress the sole of the shoe by holding it with one hand, thumb on one side of the toebox and fingers on the other side, the shoes were ready to be replaced. He did it with my old shoes, but my fingers are not strong enough to make them flex! Look at the wear patterns on the soles; that should tell you something.

Hope you figure it out soon.

KB