Never. I hit a wall sometime in the middle tiers, like say +2 where I either stop playing the character (new shinies!) or the process just becomes a pain because of the awful Incarnates interface. At that point, I may still pull one or two of the "mains" out for occasional BAFs or something, but dear god, aren't they already powerful enough?! Who cares?! I just want to have fun here, not jump through stupid hoops.