Trying the telex 850 now. Haven't come to the "it sucks" conclusion yet. I like the fact that you don't need a battery pack. Seems to cut out quite a bit of the hissing wind noise. It only does 10 or 12 dbs compared to 22 to 30 for a foam earplug. I don't take one of the earpieces off until approach so that I'm sure to hear all of those deviation callouts.
Hope this helps