I haven't been posting in a long time because I destroyed my back last summer doing core workouts with a trainer that wasn't right for me. I have a nerve impingement in my lower back now and the nerve pain hits directly in my Achilles'/heels/bottom of feet. I stopped running (and walking for awhile I was in so much pain) and just sunk into a deep, bad hole. With chiropractic care, I have it just about licked, but my heels still hurt and I'm hurting to run. I have to run and don't care what I wear on my feet. Since I have to function, I've been wearing my old NB 790's (good thing I was so sentimental, I kept them). They discontinued them, and replaced them with MT 100's, but I saw a newer version of 790's on Amazon. Are they the same? Does anyone know? http://www.amazon.com/New-Balance-Womens-W790-Running/dp/B005BW3LXK/ref=sr_1_3?ie=UTF8&qid=1329446993&sr=8-3