This can't be called a corkscrew. There is no screw. You remove the capsule, insert the needle and press the button. Out pops the cork. The speed and force with which the cork is removed is shocking at first. I haven't tried this on my older Bordeaux with their superlong corks. I hope the needle is long enough. Great product, and great customer service from Amazon with fast, free shipping.
OK, now I've used it with two older wines (a 1986 Bordeaux and a 1989 Port blend). The only criticism I can make is that the cork is released with such force that some wine jumps out of the bottle when the cork is released. I am experimenting with wrapping the device in a paper towel to catch the wine that shoots out. Even though it's a small amount, it will land on your shirt, especially if you're having guests and wearing a nice shirt. With the long Bordeaux cork, the needle extended a few millimeters into the open space and was long enough to do the job. I don't know if there are longer corks than that one, but I will update if necessary.
As for removing the cork, the device splits in half, one part turns and screws down, moving the cork along with it. The cork can then be removed very easily from the needle. Often, I don't read instructions, so this was probably mentioned and is no fault of the Cork Pops device.
Update. After several more uses, with older Bordeaux wines, I can say there is no product that solves the problem of crumbling corks better than this one. Again, the trick is to be rather forceful. Once the needle is all the way in, depress the button, ride the device up with the pressure on the cork, and remove it in one motion. I now wrap the whole thing in a paper towel, which catches the little bit of wine that jumps out of the bottle during the process. Another benefit is that you can leave the bottle upright, keeping the sediment at the bottom where it belongs.