I have been wearing the ASICS Nimbus shoe for a few years now. The Nimbus 14 and 15 were great. I didn't even fit the 15, just bought them, put them on, and started running. For some reason though, the 16 doesn't fit right. It is just a little loose, and I can't keep it from slipping on my heel. A few miles later, I have huge blisters on my heel. Eventually the skin will toughen and I'll be okay, but the shoes continue to just not feel right.