Looks are subjective but weight is not. The Stronglight cranks I dealt with were solid steel and as heavy as an anvil and MUCH heavier than any aluminum crank I've ever worked on. The weight difference was not insignificant. Also, the chainring selection was very limited and no longer commonly available. Other than the bike already has them and you don't want to go to the replacement expense or you want to keep the bike "period correct", I see absolutely no advantage to keeping them.