I have heard that the 850 = 750's plus ear plugs. I ended up keeping my Bose unit while trying to fiddle around with a ear-mold + Plantronics Mic combination. I'm still trying all different things right now, and the 850s definitely seem pretty awesome. I just can't see it being that much better without the use of batteries. My friends who use the 850 love them though.
I definitely feel a lot better using an ANR headset. But I was comparing them to the DCs on board the aircraft. The mic combo that I was using was probably the best, but the noise attenuation is still the best with the Bose.
