I insanely loved the Brooks Glycerin 12s from the moment I put them on. They were like running on clouds of jello. LOVED! I ran two half marathons and numerous 10ks and averaged about 20 miles a week in the m. So needless to say I was so excited when the 13s came out. BIG disappointment. Should have just bought another pair of 12s. The toe box is too squished, and they don't seem to craddle my foot in all the right places like the 12s did. I'm either going to just use them for work or send them back. Very disappointed.