I am currently GMing Age of Ashes. We are currently on the 4th book, around level 12, and we have two barbarians in the group. It's been working great and even though they're the same class, they are played very differently. One barbarian has the animal instinct and took druid as his free archetype. He spends most of combat tripping/grappling/controlling the battlefield, while the other barbarian, who is more of the typical 2-handed maul smasher, deals big damage.