Don't know about Nimbus.

I've been running in Asics Cumulus since #6 or 7. The last two pairs I bought were Cumulus 10. I did have one bad pair - the material used near the toes did not behave well and it hurt my toes - but all of the others have been great. I like them to run on hard surface. For soft trails, I prefered my Mizuno Wave shoes.