The live experience may well feel different to Unfold as they always play two 45 minute (or thereabouts) improvisations. Unfold is fairly untypical as a Necks album in that it has shorter pieces - music sounds much the same but in smaller chunks. It's that (slow) development over the longer time frame that really stands out as a live experience.
The contrast between their studio albums, especially over the last five or so years, which tend to include overdubbed instruments beyond the trio and their live albums (all of which reflect the longer timescales) which are all just piano, bass, drums is really interesting and instructive about their overall approach. I tend to enjoy the live recordings more than the studio. In fact, Unfold might be my favourite studio recording by them