What you're referring to with the aroma is common for Cubans, though not much beyond other N/C super premiums' aroma. BUT, El Rey del Mundos are known for their 'etheral' aroma beyond that of any other cigar. The smell continues in it's progression indefinately but suffers, like the cigar itself, from the second vaccuum period between the ages of 10 & 20 y/o. (basically translates to a 'flat' tasting & smelling period). Beyond 20 years, RDM's are supposed to be some of the most amazing tasting and smelling smokes available. What they don't posess in strength they make up for exponentially in charisma the older they get.
MRN is one of the only cigar 'experts' to have published information regarding what I've just discussed. Look it up, it will interest you I think.
Cs