I found the Ultra and Encore to be too noisy for Telex 750's without any other noise attenuation. A few years ago, I bought a Telex 850 and it's been great. That said, if you are considering a headset purchase for the Encore, I'd look into the QC2, particularly if you are interested in a headset to block out noise when airlining and for listening to an MP3 player. If you don't care about listening to MP3's on your aircraft headset, the Telex 850 is another good option, particularly because you don't have to worry about batteries dieing.