I've loved my Adizero Boston 3s and 4s and wanted to love the 5s, also, but I started experiencing tons of pain in the outer part of my foot (around the head of my 5th metatarsal), so much so that I thought I had a stews fracture. Turns out it was just the shoes. Thankfully I found a pair of the 4s online but I'm wondering what changed; I've never had this issue in any other shoe.