Portable oxygen systems - recommendation sought

T o d d P a t t i s t wrote:
This is the big disadvantage - all the cannibal jokes about
the bone in your nose.


Yeah! Good thing I was flying solo (lol). It sure stayed in place, and
after 5 hours one flight, it was still realtively comfortable. What are
the alteratives to the "bone in your nose"? How comfortable are they
after long term use? How stable are they in turbulence? I'm just
curious, I have no horse in this race.

-Bernie