Not a money-saver unless you're considering Bose 'phones.
I've had a set of these for some time, they're excellent! So good, I even bought another set for the wife.
Exceptionally good on aircraft flights (adapter included - you don't have to pay for the gash airline sets). When you turn them on, the background noise fades away like when you "blow" your ears leaving the music/soundtrack comes through spectacularly. I compared them to a set of Bose noise-cancelling headphones that my mate owned during a flight, these are just as effective.
Reduces background noise by over 70% (12dB)
Have peace and quiet on planes, trains and buses when travelling
Aids sleeping in noisy environments, including hotels, dormitories etc
Ideal at work to shut out outside noise, allowing you to concentrate
New lightweight, foldable design saves space when travelling
By reducing the amount of outside noise, which is sensed by a built-in microphone that then sends an equal but opposite cancelling signal to the headphones, it ensures a quieter more peaceful atmosphere to aid sleep. These headphones have the added benefit of being lightweight and foldable, which makes them ideal for travel as they are able to fit in small spaces. The noise-cancelling on/off switch is located on the left side of the headphones. Accessories include a carrying pouch and dual plug (aeroplane) adaptor.