Last night I tried out power leveling my shaman in SM with my mage. I was able to clear armory 1/3 at a time. My toons went from 26-32 in around 5 hrs. The 5th char was on the same account as the mage, so after the 4 reached 32 I set the to follow the ungrouped level 26 char. Tagged mobs level 30+ with the 26 and killed them with the 32s. I was getting around 350xp rested a kill.