Quote Originally Posted by jqavins View Post
Compare it to a straight attack bonus. But first, is it an extra 1d6 per whole five pips by which you hit, or is it 1d6 per five pips or any part thereof? In other words, when you just hit do you get any bonus?
It's the first type; you don't get any extra damage simply for hitting.

As with any weapon it can technically be taken by anyone, though it would mostly likely only be selected by full BaB characters focusing on high Str or Dex (with weapon finesse). It probably would not do well for a two-weapon fighter due to the penalties involved.

I suppose the perfect character for it would be a Barbarian who likes to rage and then charge but perhaps does not have Power Attack for some reason. A Spring Attack character could also perhaps benefit from this, as they generally make one good attack instead of a handful of shots in the dark.

So, perhaps consider an unarmored level 10 human Barbarian with a Str of 20 and a Dex of 16 using a +1 greataxe and Spring Attack?