I have a vacuum wine saver like
this one and I use it often, b/c I don't drink a whole bottle of wine too often, and it might be a week or two or three before I want more.
I'm not a wine connoisseur by any means. I can't tell you when it's fruity or dry or any of those things, and I don't buy pricey bottles (I just graduated from box wine - I've finally decided that's too cheap for my tastes). But I can tell when a bottle has been in the fridge, corked (not vacu-sealed) for a few days, and the wine has oxidized. It just tastes off to me. I love my vacuum sealer!