My brother purchased the Coravin Model One, and I was really impressed, so I was very pleased to get the opportunity to try the Model Two. Basically it allows you to extract wine from any conventionally corked bottle without removing the cork. The wine is "sucked out" by means of the argon gas cartridge, and there are two of these included in the box, as well as a standard needle which is used to pierce the cork and transfer the wine to your glass. This process takes between 20-30 seconds using a standard size wine glass, and each gas cartridge is good for around 3 whole standard 75cl bottles, or around 15 individual glasses. The Coravin is a super gadget, particularly if you are only an occasional wine drinker, because it keeps the cork intact, so the remainder of the bottle is left airtight and in great condition. Now I have to confess there a very few occasions where we would open a bottle of wine, and not polish it off in one sitting. I imagine that is the same in many households, and if not consumed in one sitting, it will probably all be gone within a couple of days. If you fall into this category the Coravin is a luxury you can do without. This is aimed more at the connoisseurs who like to sample single glasses from a variety of different bottles, and still be able to keep the remaining wine in all those bottles completely untainted. Now that may be a small market, but I know quite a few people who fall into this category, and for them, the Coravin is a real godsend. Replacement gas cartridges are expensive, so you need to ensure you do not use too much when extracting your wine. You soon learn how to use the Coravin to optimum effect. There are also other sized extraction needles available, although I find the one included (standard size) is just fine. You will probably look at the price of the Coravin Model Two and think there has been some kind of mistake. Well there hasn't, and that's because it is aimed at a market where £250 is often a fraction of what you pay for a case (or even a bottle) of wine.