After several years with two LightSpeed headsets I decided to make a change. They are not robust enough for daily use by professional pilots. The same would seem to apply to both the Zulu and the Bose X. Good after sales support is nice but I prefer a headset with long term reliability that does not have to be sent back to the makers, particularly when they are in another continent. DC seems to make some sturdy non-ANC headsets but its ANC headsets seem to lag behind in performance. After checking no end of threads on various forums and numerous printed reviews I came to the conclusion that the best value for money in performance, comfort and long term reliability is the Telex Stratus 50 Digital. Apart from its outstanding acoustic performance, out of the box it runs on either batteries or aircraft power and has plug-ins for cell phones and iPods. I obtained one ten days ago.