Oops.. My bad. It is Reaper's Toll. I thought you were refering to a Stormspire which is a unique Giant Thresher. In that case the only reason to keep the bonehew over the Reaper's is if your are a Necro or you are another character using a curse (like a pally using Dracs). You shouldn't even need to waste a socket quest on the reaper's. The life leach it comes with should be sufficent. When the decrep curse hits then your merc ends up hitting them alot more than they hit him (usually). I would dump the Griz armor in favor of a Shaftstop or an Up'ed Shaftstop.