Is there any reason not to buy the same make and model of running shoe? I had my gait analysed back in December and got some Asics Gel Pulse 7s. I have now done about 700km in them and I'm guessing I am probably due some new shoes. I haven't got a bad word to say about the shoes I have been running in this year (except their smell!) so should I just buy another pair of them or do I need to get my gait analysed again?