" The amped-up aggression and heaviness on Underworld, suits them - even though it took them 20 years to get here. That newfound sense of physicality is combined with the finest elements of album rock - in the best '70s sense of the term - anthemic '80s hard rock, and modern power/prog metal here. As a result, Symphony X sound reinvigorated, fresh, more vital than ever - unbound by their own history, but providing a near perfect extension of it".