Very good for the price
These noise cancelling headphones are a good buy for the price.
Having played with a colleagues Bose headphones, I can say that the performance of the Lindy NC-40 is not as good as headphones in the £200+ range, but the effectiveness is more than adequate for my primary purpose, which is for air travel.
The low frequency noise which is a problem for air passengers is dealt with very well by these headphones* allowing me to listen to musing at a much lower level. Wearing them even when not listening to anything allows me to arrive at my destination less fatigued than without noise cancelling.
I did once try a £20 pair of headphones with active noise cancelling, but they introduced a hum which rather defeated the object of them!
Given that I might, one day, leave these on a plane - I am glad that I have found something that works for me at this price range rather than at £200-£300.
The purchase referenced here was actually a second pair, for my daughter. She complains that they can't be comfortably worn around the neck when not in use - being a little tight for that. This is true - although I do not find it a problem for my application. I tend to put them away in my courier bag when not using them.
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* Simply because low-frequency cancellation is easier to do, from a technical point of view. It is simply a matter of introducing some anti-phase noise from the environment and phase shift is not very critical. At high frequencies, pase delays become an issue - which is why expensive headphones contain a microcontroller with a Digital Signal Processor. Hence the steep price.
Verified purchase: YesCondition: New