Up until a year ago, I had never used or even heard of shoe trees. It's amazing how being around the right crowd and learning from experienced individuals changes your life. NONE of my family, relatives or even friends use shoe trees, but then again they don't know what makes a quality shoe let alone why paying the premium is an investment. That being said, I have shoe trees for every shoe I own (At this moment is 7, hopefully more soon) . I use Woodlore Ultra's for my better shoes and like them very much. Now the post: I would like to hear from people about the longetivity of shoe trees and the shoes with and without the trees. What would the average lifespan of shoe trees be, assuming they are used everyday? How many years before they're replaced? While Woodlore suggest sanding every year, how often do you sand them? In terms of benefit for shoes: While this may actually require experimentation, has anyone noticed that their shoes last longer by using shoe trees vs. without?