/NIN I'd main hand it. Guess I'll end up selling off my other swords I use for that job =/
Might use for /WAR as double attack is already there. In all honesty Joy might finally be dethroned. Yes TP spam for Atonement but what if this new WS we are getting can outdo Atonement and also is based of swords DMG? Yeah I doubt it too but still we don't know.
Honestly looking at this as a future replacement for Joyeuse (I am kinda doubting they'll let you augment Joyeuse.)