I would only polish the Epic if you intend to keep it that way. I did it with a friend of mine, but then I could not get it back to the out of box condition nor did it have the original reaction.  I'm keeping mine dull just as it came out of the box even though I just got an Epic Battle in for myself.  My philosophy is, if it came dull, keep it dull.  If polished, keep it polished.