If the idea behind Heritage is suppose to be a blending of all of the Guerlain men's fragrances released prior to 1992 (its release date) then I must say that succeeds, because the perfume is very "Guerlain" - but if I had to describe it in my terms of geneologies, I would say this is influenced by three great fragrances that have come before it, Shalimar (1925), Bois Du Portugal from Creed (1987) and Tsar of Van Cleef and Arpels (1989).
It is most immediately sensed upon application the strong similarity between Bois Du Portugal and Guerlain, and if I had to nominate and fragrance to say could be its stand-in, this would be BDP. Heritage however, certainly does make itself distinct in a number of ways along its development on the skin. The first noticeable difference would be the fruity note, which some people complain creates a bit of a sour feeling. Although it is not mentioned in the official pyramid, this fruity note is largely created by allyl amyl glycolate, which is used in other perfumes (notably its contemporary: Tsar) to create a suggestion of pineapple. This fruity note lingers for a while into the drydown at which point one notices another difference between BdP and Heritage: Heritage, true to Guerlain form (think Shalimar), concentrates its basenotes more solely into vanilla and woods (with a touch of patchouli), whereas BdP's drydown is made more complex and powdery via the use of vetiver and moss.
If I had to give my personal opinion on Heritage, I would say that it is slightly less "together" than its predecessor Bois du Portugal, and neither the fruity changes at the top, nor the softer more comforting vanilla drydown are neccesary nor are they an improvement upon BdP. However, it is readily available at a much lower pricepoint, and if one has such economic limitations (I personally couldn't afford either at retail right now!) then I believe Heritage is an excellent stand-in. Even hours into its drydown (EDT applied 6 hours ago) it still radiates class and quality. Long lasting with quality ingredients and reasonable construction - Four stars!