My son has a nitro system, and that's his big complaint, nitro'd bottles don't open up.There used to be (and maybe still is) a publication of consumers' ratings of wine that is similar to the Zaggat's publication for restaurants. (Sorry I can't remember the name of the publication.) One of the criteria was how well an opened bottle of wine improved over the next four or five days. My point is that a lot of wine intended for daily drinking really does improve during that period of time. I regularly drink left over wine and I've never used any device intended to keep it as fresh as when it was opened.