I have seen everything from the company provided non-active Sennheiser ones to the Bose A20 on the bus. Personally i still use a Bose QC15 with a u-fly mike, however, i consider to buy a replacement for it, the headset begins to show its age. I might go fo the Harmony solution, but all those different packages and stuff are kinda confusing, not to mention its not available on short notice anyway.