And finally the customer service is top notch - I received an email with set up instructions after purchase plus a follow up to check how I was getting on a week after that

As long as the fit is good and the mediums are spot on for me, then they are effective at blocking outside noise even when using my iPad (which are notoriously quiet even at full volume) on the tube I can hear music and dialogue equally well (which can’t be said for my overly expensive B&W P5s)