I definitely wouldn't get the single side 750, but it might be okay if you just fly domestic. When I we go to some place like Incheon or Karachi, I need all the clarity and isolation I can get to understand the controllers reliably. I also appreciate the 850 when trying to use HF radios. In these cases I wear both sides of the headset over my ears and just listen a little more carefully if I see the other pilot talking. The rest of the time, the 850 is perfectly comfortable with one pad behind the ear. The 850 also has better earpads than the 750, it's some kind of synthetic pleather rather than the foam on the 750.