With Altra shoes you definetely have to go 1/2 - 1 size bigger than your usual size. Other than that I love them, and everyone else that I have seen using them. My switched from sauconys, brooks and asics to Altra and Hoka One One which are amazing for the comfort, stability and support of my feet, no pain anymore on my hips, legs, kness or lumbar back...I am sure that says it all.