I always figured that there wasn’t much use for such a thing, except they make nice replacement stoppers if the original cork won’t fit back in the bottle. I do suspect that if you’re deeply concerned with keeping your wine fresh, that (a) it must be very expensive wine, and (b) you probably can afford some kind of nitrogen purging system, because obviously you love your wine as if it were a tube amp.
One thing I have noted is that when I use it on white wine, I see lots of little bubbles, which I like to pretend are the dissolved sulfite gases being expedited from the bottle.
