Sennheiser S1
I disagree firmly. The Sennheiser definitely does not out perform the lightspeed zulus regarding noise cancellation! I was up flying today and
my friend who was with me has the zulu 2 and me the Sennheiser S1 so we switched during flight. The zulus were so much quieter even upon using the smart update button on the Sennheiser. I will be returning mine tomorrow but I am going to go for the Bose A20 to trial for the 30 days. I hope they outperfom the lightspeed but if not, obviously the lightspeed zulus will be a clear winner!!