I have a telex 850 and i think it sucks. I fly the CRJ and the radios sound like crap. It is really hard to hear the controllers and with the ANR turned on they are not understandable at all. It makes them sound like they have socks in their mouth BLAH BLAH BLAH is all you here. They other day I jumped with JetBlue and used a sennhieser or however you spell it and it was crystal clear. However to really compare the two I would have to use the same aircraft as well. I have an email into telex and I will see what happens and if they think it is a fault of the 850 but at the moment I am going to use my DC standbys.