This bottle sealer is not a necessity but is nice to have on hand. To be fair, this device has not been used very much at my home. In our house once we open a bottle of wine, other people also want a glass or two and it does not get put away. because there is none left It does seal the bottle okay, as the wine still taste fresh. On the other hand, before I had this a bottle was left in the refrigerator for a month while I was gone a half bottle of wine had to be poured out it was so bad. I have never had the opportunity to try to duplicate the experience using this sealer. The one type of wine that it is not recommended for is sparkling wine because you don't want to suck the air bubbles out, but that is the one type that if opened, we have trouble finishing the bottle as the dryness is dehydrating.