Clearly 5 star for this, which is not to exceed at coolness. Sure it's partly unlike most ZZ Top works before and after, but for me one of the strongest albums of the band. Just because it is partially different. It has little to do with Tres Hombres example, but any more than with eg Eliminator.
One can somehow not at all describe really what it sounds like, just simply cool. Just listen. Repeating individual tracks on counting is not because every song is cool in its own way.
Perhaps as a small clue, the album is not as blue as the heavy early works, but not as heavy as the later albums. Relaxed guitar sound, to enspannter singing.