Works as Expected
I purchased this as a gift for my mother. It's a bit of a special purpose item that may not be suitable for everyone. The entire thing is one "cork" and must stay on the wine bottle to function. This was perfect for my mother, as she'll only ever have one wine bottle open at a time. Wine-tasting types, though, would probably prefer one of the more expensive vacuum cork machines that can seal multiple bottles.

The Oster Vacuum Wine Cork seems to work exactly as advertised. The initial use was a little confusing. After installing the two AAA batteries that came in the package, the expectation was that the buttons would do something when pressed, the display would light, or something to indicate that it was "on". On the contrary, nothing will function until the device is actually one the wine bottle (which is actually pretty intelligent in retrospect). Once on the bottle, the top button will initiate the vacuum sequence, which takes approximately 60 seconds to complete (the LCD display shows a countdown). After the vacuum seal has been created the LCD display will show the temperature of the wine to (to one/tenth degree) in either Fahrenheit or Celsius (toggled via the button directly below the display). The bottom-most button releases the vacuum seal (another 60-second countdown cycle).

All in all, the device seems to function very well and creates a tight seal even before the vacuum. My mother has only had the vacuum cork a few days now, so I can't speak to how reliable it will be over time. Nevertheless, construction seems to be of good quality.

Doesn't work, keeps on giving error
I tried to work this thing many times, but it always starts by working on creating a suction and ends up giving an error. It should not really be that hard. if you are looking for a bottle cork invest in something cheaper. I would not recommend buying this. The idea is great but implementation is really poor.

doesn't suck like it should
disappointment... it doesn't work very well - sometimes it wont seal at all. I've gone back to using a regular stopper.