This strikes me as a bogus collection of music, one of those things that just happens to stars from bygone eras. Labels come and go, artists enter and break contracts constantly, and you end up with all sorts of "best of" and "essential" collections of music.
With that said, this collection of music is astounding. For some reason Night Nurse is Isaacs best known record. It is a good album, but it's not his best. The music on this record is incredible. The Wailers may have had the best reggae band, but Isaacs will always be my favorite reggae singer.
Do be aware that some of the cuts on this album are older and may not have been remastered well or at all. The fidelity is lacking in parts, but hey, it's all about the skank.