I took the Bose In-Ear Headphones with me on the trip to the US.
They performed well but I have some reservations. First I found that after five or six hours on a plane my ears get quite dry and anything in my ears gets scratchy. Second, the little plastic sleeves that provide the variable fit come off a little too easily – on one flight I lost one inside my carry-on and that was it for the Boses until I hit the ground and could spend ten minutes searching the bag properly. Finally, adjusting them to get great sound is a little fiddly.
As a result I’ve decided to go back to my Sennheiser PX 100 foldables, at least some of the time. I’ll continue to try the Boses and see if time and experience make them easier.