I've been using the earlier versions of Omni for many years now. I wanted to replace one of my older pairs. I've read some negative reviews of Omni 10 so I decided to go for the Omni 9. The fit was completely different, these shoes are much more shallow than my previous ones and I had the feeling that they barely hold on to my feet when I walk. I couldn't imagine running in them so I returned them right away.