FWIW I used the Telex 850 for about a year and then found out about the Uflymike (I had the QC2 already). 2 things spring to mind after changing; my fatigue levels dropped considerably and my ability to hear ATC properly (esp. Italy and Spain, but I guess that's a different story!) increased significantly.
Were these because of the headset?
I had to revert back to the Telex for a month or so after the Uflymike picked up a fault and had to be repaired. Guess what? more fatigue and more of "say again" on the radio - less comfortable all round.
I personally feel the small outlay was/is worth it and I wouldn't touch the 850 unless I was forced to.
In the end it comes down to personal preference and the a/c type you are flying
Last edited by tradewind; 19th Mar 2013 at 21:52.
Reason: added a bit