Bought one of these for a wine-loving friend's birthday, and I have to say I was a bit worried at first because it didn't seem to work. Think the needle had got stuck a bit, possibly during transit. Just as I was apologising profusely and telling him I'd send it back, it finally managed to work loose. Now every time I'm round there I see it in the top of another bottle, so I'm thinking that's a good sign. Quite tempted to get one myself. I would recommend giving it a test run to check the gauge works (and to work it loose if not) before giving it as a gift.