3.1 is supposed to have more Wolves Den (I don't think the Dev team has actually mentioned it recently, so I have a feeling it might have been pushed back to a later content patch). With new PvP content, most of the PvPers will be trying it out. So if you're close to rank 50 and considering trying out the new content (whenever it does come out), I'd recommend getting the set and putting materia on it.