is it worth returning it to jaxon?

what do you get, other than the achievement?

An Eater and some sP (I'm pretty sure it's an Eater every time this year, anyway). The Eater isn't worth much and I'm not sure if the sP is random or a set range but I got 111k for it. I did it for the achievement though, and if I were to get another one I'd keep her for my gallery.