Since what I kill in my shoes are first the vibration absorption and then the outer heel, and given what I see in this thread, I'm wondering if I should take a pair of CB4.3s. Well, Never put an hole in any shoe I had, and even if I used the outer heel of my AMC first, my knees were crying for a change first. At $70 the pair, even without warranty, it's be a shame not to take a pair though. Is the sole on the outer heel thinner on the CB or on the AMC? Can't tell. EDIT: Went to a shop today. And the sole on the outer heel of the CBs is indeed thinner than the AMC. Too bad, were on sale.