I've been running in the Gel Nimbus for several years. I LOVED my Nimbus 11s and wanted to be sure to get another pair before they became extinct. Although I ordered Nimbus 11s, the company no longer had my size and sent me the Nimbus 12s instead. I don't love them. They have lost the wonderful cushion that I loved so much and they seem very stiff to me. I thought maybe after I broke them in for a few runs I would change my mind, but sadly, that is not the case. Now I really can't find my size in the old reliable Nimbus 11s.