I have this poster in my small collection, mine is also folded, I'm 100% in the "leave it as it is" camp on this one, I have had mine up and framed in the past and while I would have loved to have had a rolled copy of this great! poster I think it still looks pretty good framed even with the folds.
As for those asking about price, when I've looked recently a folded one is usually around £400-500 if you buy through a dealer, as for a rolled one I've not seen one for sale in rolled condition since I've been collecting posters over the last year or two, but, my "guess" would be a dealer would probably be asking £800 or more for one in rolled condition.