I purchased these on the recommendation of several of my co-workers, as we all travel frequently, and have dealt with noisy or distracting airport terminals and planes. They were worth every penny.
They come with a nice, 3x5x1 1/2 inch, zip-close carrying case, that fits the headset itself, the charging cord, and two extra sets of flexible ear inserts--perfect for travel. My sole complaint is that the case itself has the Bose logo in clear grey on the outside of it, which made me worry that they would be easy targets for theft (the logo is also much more subtly marked on the zipper tag, so I'd have preferred that be all). The set itself has an inline volume control and mute/pause, and a clip to attach to your clothing with an overall length of 4-4 1/2 feet, so plenty of room to tuck into a pocket while moving, or to move around if your device is sitting nearby.
After purchasing them, I tested them at home, by having my son ring the doorbell and letting my 4 large dogs bark. Without the noise dampening, I could hear them; once I turned the noise dampening on, wow! Almost completely gone, even sitting 4 feet away from the front door where they were barking and at the same volume. We then traded, and my son tested them the same way, then with me clapping 1 foot in front of him, yelling and banging on a pan in the kitchen. We took them outside, as the LifeFlight helicopter went over the house, and as emergency sirens were sounding nearby. My son wore them as we drove across town to a birthday party amid honking horns and traffic noise. Again, each time, the background noise suppression was fantastic.
During my next travel, I had a family of 3 crying, toddler age children sitting behind me on the plane-- turned on noise suppression, and not only did that disappear, so did the noise of the plane itself. I used them in the hotel, and they blocked out the noisy people above and outside the door.
I highly recommend these in noisy circumstances as a result, and issue only this word of caution-- these are Not the earbuds I would recommend for working out out-of-doors or while driving, as they will completely block out the noise of other people or animals approaching, sirens, and honking.
Well worth the money.