Mas de Daumas Gassac has come to be described by some as a "Grand Cru of Languedoc". These are indeed wines of excellent quality and are in the Bordeaux mold, based on Cabernet Sauvignon, with the necessary structure and stuffing for a prolonged period of aging in the cellar. They have more than once been mistaken for a St Estèphe in a blind tasting.  These wines frequently need decades of bottle age.