I am a dedicated Asics Gel Cumulus wearer because I require a narrow shoe. This is my fourth pair. I don't know what is different about the 16 but it took more than a few runs to get used to these. My feet and legs got really sore. I was really disappointed for the first week i had these. This isn't typical. However, I think things are starting to improve and I feel like they are beginning to feel like the shoe I expected. I'm hoping, because this is my go-to, faithful run shoe brand. I would have given all other pairs I owned 5 stars.