Haven't done the boss itself but from seeing others do it on stream I don't like it, not much of a PVM-er anyway, plus I already had a negative opinion to the whole thing (new boss, but more so the new rewards with staff and off-hand). I'm just glad they didn't release the book too. I think the drop table is good though, IMO bossing should be almost a cost until you get a drop.
I was PKing in PVP worlds on release though, got some good loot. Also merched a ton of stuff for this update which brought me a whole lot of money.