Been using them for many years...
I could write several paragraphs but suffice it to say if you vacuum seal wine that you haven't decanted or left open for a week, it'll remain fresh for at least a couple weeks.
Keeping open bottles of wine drinkable!
I love a glass of good wine with dinner... OK, sometimes two. Much to my doctor's relief, I don't drink a whole bottle at one sitting. To save the leftover wine, I use the Vacu-vin system. It's extremely affordable, the toppers are reusable, and it's much more convenient than some of the higher priced vacuum systems (or the nitrogen spray). Plus it's a fun workout pumping out the air! Make sure you get the pump, too.
Vacuvin products are getting worse
These stoppers require that you hold the pump more perpendicular above the stopper and then hold the seal more firmly. They aren't as forgiving as the old stoppers for when you hold it at a slight angle. Its frustrating when technology moves backwards, and then they call it progress. This company used to have a better product line with their containers as well. However, Vacu Vin Wine Saver Extra Stoppers, Set of 4 might still be better than the practically non-existent alternatives. Vacu Vin Wine Saver Extra Stoppers, Set of 4 deserves three stars, but I'm giving it two stars because so many of the other reviews are skewed way too high.
Vacu Vin Wine Savers do Save the Wine
I've tried everything else. This is the only way to keep a bottle of wine from going bad. Unless the weather is extremely warm, it will last for several days after opening it. I love Vacu Vin Wine Saver Extra Stoppers, Set of 4.
Wine keepers
This is an excellent product. Inexpensive but saves money. I am a one glass of wine per day person. Now I can enjoy the same taste as the day we open the bottle. Highly recommended.