its good until 65+. during a WoS fight with minimal DPS in the group, this spell lasts one fight or less. granted, its great for pulls, as mobs in OoW really like running full speed into a player and getting 3 hits off in a row, but its just not as effective as groups of pre-65s, as then it lasts much longer. normally i keep this memmed with a nuke and yaulp and refresh as needed.