Score one for Bose. I've had mine for 2 years of short and longhaul flying and it developed a warbling noise as you started to descend. Very annoying. Posted it back to HSL in Shoreham and it came back within a week. All new hygeine stuff, 2 new earphone modules (corrosion!?) and some minor monkeying around with the mic. Total cost? £11 to post it and absolutely nothing else. Happy customer.