wrote:

The MH is very deluxe. You feel great on about 1/4 the oxygen
that would usually be required.

Probably not for the casual user tho... It would take a lot of fills
to justify the price.

The reason why it is popuar among glider pilots is not economics, but
convenience and safety.

Convenience: Put the cannula and turn the system on before you start and
forget it for the rest of the day.

Safety: Because it uses very little oxygen, we can use it at lower
altitudes without the risk of running out of oxygene. Many of us set the
threshold as low as 6000 ft. Believe it or not, but we think we feel the
difference. (Less fatigue, no headache the day after, generally better
flying.) Of course, glider flights differ a lot from powered ones: the
duration of glider flights is typically somewhere between 6 to 8 hours
and at very varying altitudes.

Stefan