Telex 850 vs DC pro / pro X?

I have no experience in the Embraer, but I have experience in a Lear 35 with both the 850 and Pro X.

I returned the 850's once I returned from my trip and purchased the Pro X. The 850's let in too much ambient noise.
 
Just bought a new set of Bose. Highly recommend. I forgot to turn them on and the passive NR was better than the ANR from my old headset. When I realized I'd forgotten to turn ANR on later in the flight, I turned it on and instinctually looked at the engine gauges because the noise reduction was so marked. They are really nice.
 
I use the Pro X in the 175. It's been a great headset. The only downside is changing out two AA batteries.
 
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