i took this route. you get an extra attack for every 10 you complete, and thats with just 2 of these items equipped. and if you use the crystarium to your advantage then her strength should be equal to that of fangs and her magic to that of hopes, at least mine are. so for me she does the same amount of damge and get in an extra 2 attacks. the one downside is that if you level up her axis blade to omega then you lose the boost group on it.