I am a chef and Sommelier in NYC where every gadget comes down the pike as either a gimmick or a time saver. This product was disappointing at best. I bought a tannic California Cab as a test and after a half an hour (in a Riedel Glass), there was next to no difference in the strident and pronounced chalkiness of the tannins. After an hour, the wine lost some of the vanilla characteristics of the oak, but maybe that was an "Emperor's New Clothes" phenomenon because I really wanted this to work. I returned it (Amazon still has the best customer service) for a newer decanter.