This Coravin Pourer looks like a cross between a corkscrew and a soda siphon and with good reason because it employs the features of both. Essentially what it offers is the facility to decant wine from a corked bottle through a fine needle using the pressure from Argon gas to draw out both the wine and the oxygen. And it works! Consequently you can enjoy non-oxidized wine for a number of days after opening -no need to finish a bottle in one sitting or to hesitate to open two or three with different courses. Its not all plain sailing-personally I hated the picture instructions which are about as clear as those for self assembly furniture and make the process of setting it up more complex than it actually is. You basically load a capsule, use the grip to hold the bottle, press down to pierce the bottle with the needle and then use short shots of pressure to pour. One key piece of advice: you absolutely must hold the glass at an angle of at least 45 degrees to get the wine to pour which it will then do in 20-30 seconds for a typical glass.The other observation I would make is that the needle is very sharp and should be left nowhere near children. There are renewables that need to be bought-2 gas capsules are provided, but after that you need to buy more. This is very much an up market design product so you get smart packaging alongside good build quality hence if you want to give a posh gift to a wine lover then it looks the part. My biggest gripe with the device is that it only works with real cork so if, like me, you love good quality Australian or South American wine, then many of your favourite vintages will be off limits with this pourer-this also applies to artificial corked bottles. Nonetheless if your main concern is about whether it works or not, then the answer is yes it does and for the serious wine buff or if you work in the trade and give tastings this is a genuinely useful device.