There are many that say "look after you teeth and your feet and the rest of your health will look after itself". Sadly, I don't know entirely what this thinking is based upon (logical common sense I assume), but anyway I do take my feet seriously and do try and get the right running shoes. When I first started running I went to a specialist shoe store keen not to destroy my legs running on unsound shoes. They recommended a very strong pair of shoes, I weighed the best part of a stone more than I do now at the time, and they promised that I would need these to keep my knees healthy.
Since that 'diagnosis' I stuck with those large strong trainers, I think I've been through at least five pairs. I hadn't given any consideration to the fact that as I got lighter and fitter the type of suitable shoe might change. Last week Mrs. Taffi and I went to a different specialist store that has video gait analysis in store. The experience was very illuminating, we both came out with new shoes. The biggest single benefit I could instantly see was that my new runners are lighter than my old ones. I had felt that at the end of a long run I was lugging my shoes along on tired legs / ankles. I just weighed the shoes and my old pair weighed 1kg, my new pair 0.88kg... I am suspecting this might make a very real difference at the end of a half marathon.
I have only run on the new pair once so I can't say all that much about the difference in support or comfort between the two. I guess time and aches (or lack of aches) will tell. Hopefully I will continue having happy healthy feet.