Noise cancelling is so effective (it did the job silencing descending planes and office chit-chat) we find ourselves reaching for it on nearly every occasion. However, the ear cups provide a good enough seal to keep outside noise to a minimum for general use in quiet places.
It does help reduce the thudding sound of your footsteps that unfortunately come through the H8s when you walk too, so bear that in mind if it’s primarily hiking partners you’re after.