Apollyon Sun was a project that Hellhammer/Celtic Frost/Triptykon mastermind Tom G Warrior worked on between incarnations of Frost. This particular EP was Apollyon Sun's first release followed by the album Sub. I wouldn't recommend it to a casual fan, but fans of Warrior's other work should enjoy it. The music is moody industrial/techno metal rather than the death, black and avant garde metal stylings of Celtic Frost. Some of the tracks here appear as somewhat different mixes on Sub (eg 'Reefer Boy' and 'Concrete Satan'), and both versions have their own charm.