I just picked up a pair of Asics Gel -Fortitude 4. I have over 300 miles on my old pair (Gel-Fortitude 3). They feel the same to me as the previous model so I am hopeful of having the same success with the new ones. Why do the shoe manufacturers have to change the model so frequently? So you buy multiple pairs when you find a shoe that works for you-yes. So they can raise the price-yes! Anyway, I look at the cost of a few pairs of new shoes every year as much cheaper than doctor bills, so if good shoes can keep me running I will continue to buy them.