I agree with Neosito, if you can use this Great Axe, then by all means do whatever it takes to get one. I went through a lot of different GA's on my WAR. even camped NM's for the insane priced ones on AH. Byakko's Axe is the best of them all *IMO* lol fun to use on puks when you don't get a pt that haises rell on you.
With the new Augmentable Greataxe from Succor to the Sidhe quest, it's possible to get a Gaxe better then this one, with a lot less effort (Mine has 91+4 damage, +3 STR and +8 attack) and I only did the fight once. There have been Gaxes with 91+5 damage, +5 STR and then some attack or double attack on them, which really outclass this Gaxe.