I have been using the model when it was still called by the 2010 series name. The upgrades have in most cases improved the shoe and the running experience. From V9, Asics has attempted to lighten the shoe and i think they have achieved just that. The V11 feels snug and comfortable from the very first run. Also V9 onwards has seen better cushioning for the forefoot.
Voucher code will be found in your welcome email