Sauvage is the default modern men's fresh-spicy: bergamot and pepper up front, then a dry ambroxan-woody finish that stays loud without turning sweet. Longevity is typically a full workday; projection is stronger than a polite office cologne, so two sprays is enough in heat.
Buy it if you want one bottle that strangers already recognize as 'clean and current.' Skip it if you hate ambroxan, already own a loud blue freshie, or need something quiet for a packed train. It is versatile, not mysterious.