Prior to buying Kayano 15, I had the 12. I wore it for 5-6 years and loved it to death. I ran 5 marathons, 5,000+ miles, 1 ironman, biked across country and it was wonderful. Sturdy and hardy gave me the proper arch support. It was obvious that I was going to stay a Kayanos man. This shoe is everyhting the 12th iteration was. I hope to run this pair out as much as my old one.