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Ed,
Oxygen in the 360 really opens up the utility of the airplane.  The first week
of owning our Mountain High system, it made the difference between trying to
negotiate three scattered to broken layers (tops to 16,000') across the entire
state of Nevada or simply flying across the top of it all in clear blue skies.  
The short wing does remarkably well up high in terms of drag.  On a standard day
I can maintain 200 KTAS even at 17,500'.  Things get slower as the temperature
goes up.  You will notice reduced stability in pitch and roll.  Everything
becomes sluggish. You'll also notice the increased angle of attack in that thin
air.   What you gain is increased endurance since fuel burn drops significantly
(6-7 gal/hr on a 360).  Also, higher is generally smoother.  On any trip over 2
hours I typically go straight to 16.5/17.5k.  These planes climb so well that it
is really not a big deal get up that high.  Now I even keep a large oxygen
bottle in the hangar for really cheap refills.
You don't need pressurization to not feel 'beat up'.  You can increase the
oxygen level in your blood by either pressurizing the ambient air or increasing
the concentration of oxygen in the air you are breathing.  We use the Mountain
High EDS and feel great even after 4 hours at 17.5k.  
Chris Zavatson
N91CZ
L360std
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