I studied (did all calculations) the second edition of the book. The book aims at deriving the main equations of fundamental physics from symmetry principles. The book pursues this goal in a logic and clear way (a great number of calculations are done in detail), never drifting away from that goal. Having studied other books on symmetry, this purposefulness is quite unique. The book still has some flaws (which explains the missing star), but they are no reason to steer away from an  insightful reading. I can testify that the author is easy to reach and that he welcomes comments and corrections. This is not always the case; I tried to send a long list of corrections to the author of another book on symmetry in physics: there was no contact information (no affiliation, no email address), and when I finally reached the author I was told my corrections where not welcomed!