I had hoped to "move up" the Asics ladder from my trusty Gel Equation 2s (TN871) with my purchase of the 15s but I am very disappointed. The fit is odd. They're tight in the arch and very loose in the toes. And the support is not very comfortable except in the heels. I had never had hip problems until wearing these shoes.  Darn it!
For the price point I was hoping for more.  I'm going back to the Equation trim hoping that the 4s will be a good choice.