I have run the last three marathons on three pairs of Asics GT-2140 with great satisfaction. Never changing a winning team so I managed to buy one of the last pairs available while preparing for the next one. I use a trial version for winter training in mud and snow for better traction and water resistance. After a period of trying different types and brands (I have a weak ankle) this is for me; combines good flexibility and responsiveness with excellent heel and midfoot support. Most supporting models are much more rigid. For my next purchases I will be forced to switch to the GT-2150 or 2160; See how it's going.