I know that using EA with a warrior is a big no no... but what about with a feral druid tanking? I seem to be running alot of instances with druids lately and I just realized I didn't know the answer to this noob question. Be nice....
To my knowledge it doesn't ***** with Faerie Fire, so if you have a highly melee oriented group, hit it up, otherwise you'd prolly do more damage spending your combo points elsewhere.