I have the telex ANR 850. Good headset and tso compliant. I have never seen anyone make a fuss about a headset being compliant. I even know of some check airman that use non- tso'd headsets. If someone gives ya sh!t about, just pull out the ships headset and use it until the a $$hole is gone, then use your own. Again, I have never seen anyone make a stink about it.