I first became a Nimbus fan with these shoes. The next 2 year models were not up to these...13s and 14s. Recently, ordered another pair of the 12s and compared them side by side with the 14s, 12s on 1 foot and 14s on the other and switched. Big enough difference for me to stock up on the 12s. Nimbus 14s have less cushion, support and toe-box slightly more narrow. Though the Nimbus 14s are slightly lighter, the lack of cushion and its stiffness results in a flat feel when running.