Reposado means "rested", and Cazadores Reposado gets its name from resting for over two months in new, small, American white oak casks.  Most other tequilas are aged in old, used bourbon barrels.  Aging in new oak casks combined with the fact that Cazadores Reposado is made from 1,000,000% Blue Agave is why it is rich in aroma and flavor.  (Okay, it's 100% Blue Agave, but you get the point). 

-From the producer