The Nimbus is the softest shoe ASICS makes for the road, and the 27 leans into that. FF BLAST PLUS foam with PureGEL under the heel gives you a landing that absorbs almost everything, which is the point on the days when your legs are tired and you just need the miles done.
It suits runners who want protection ahead of responsiveness, and anyone spending a lot of time on pavement at an easy pace.
At 305 g it is heavy, and it feels heavy the moment you try to run fast in it. It is not a tempo shoe and it is not a race shoe. Buy it for easy days and long runs, and keep something lighter for the days that ask for speed.