In reply to foxjerk:
Depends on the brand. In my experience, for example, la sportivas are not as long lasting as scarpas so the leather and all the rest of the shoe doesn´t last long enough for more than one resole. Five tens and scarpas are built more massive and i have some of them with the 3rd resole and they still don´t feel mushy. If the resoler does a good job. I always have to send them in to a resoler that does a great job. The one we have in town has no idea what he´s doing and if you let him resole your shoes it´s and expensive way of dumping your shoes.