I have trialled a pair of these headphones. They are truly the best of their breed, although they are also the most expensive. 69 quid on Regent Street. But the audio quality is simply amazing. Ideal for clandestine recordings in the field. They come with three sizes of earpieces to ensure a snug fit. But I am surprised that they didn't include two sets. The case for the headphones is clever too....neatly protects the headphones, though it closes with a magnetic clip which needs to be kept away from credit cards.
