Richard Riley wrote:


If you're buying an o2 setup, I recommend the Mountain High. It's
sensor gives you the properly sized and timed puff of 02 each time you
inhale. It makes a bottle last about 5 times longer (my subjective
guess) than a bottle with just an oximiser canula.

I was turned off by Mountain High because of their attitude at Oshkosh
last year when we were shopping for oxygen cylinders. They weren't
able to explain their black box, nor does it have any user settable
adjustment to increase the flow. They did spend most of their sales
pitch insulting the Precise Flight company and the claims in the Precise
Flight literature which I haven't found to be innaccurate at all.

In the end we got the Precise Flight with the new regulators. These
give a puff on inspiration (similar to the MH) but they are purely
mechanical (like a scuba regulator) and while you have to set them
for the altitude, you can tweak the setting as you see fit. The
claims of oxygen bottle duration using these seems to be as PF
claims in their literature (much to MH's chagrin I suppose, it
was one of the things they claimed couldn't possibly be true and
it's much longer than their units).