I dont really think its worth to lvl up bs as shammy for this item. Imho beter go for dragonmaws/strikes x2 as they r not mh uniques anymore after 2.4 released. With 2 of those maces(mgoose+exec or new enchant that will come soon{improved icy weapon} u could pwn so freaking hard both at pvp and pve.
As it was said b4 this item is primarally usefull for warrs and pal5s as it has nearly the best weapon dmg range thats very important for both. But shammy should better go for any gladiators variants of 2h as it doesnt have live stats but raitings, that will give more stats to shams and its also free, if u care about a gold ofc.
Hope it war usable point of view.