In our tests, this instant aerator noticeably enhanced the aroma and flavor of young red wines, softening the texture in seconds. In fact, we found it yielded better results than letting the wine breathe in a decanter for an hour or more. Based on a principle known as the Venturi effect, it aerates the wine while it is poured into a glass; as the wine flows through the funnel, it creates suction in two small holes in the stem, drawing in air and mixing it with the wine.
A very interesting piece. I was recently at a friend's house who used one of these things - I was perplexed and wondered whether there was any real improvement, not having had a chance to taste test as you have above.