Agreed with most of the foregoing.

I'd be a lot more inclined to recommend aerox, if they didn't sell such complete garbage. For instance take a look he

http://wingsandwheels.com/oxygen-equ...ula-masks.html

That clear plastic mask is a total embarrassment, likely to break before first use (that's its best feature -- saves failure at 25K feet). The needle valve and flow meter assembly shown (the one with the right angle valve at the inlet) will almost certainly break on you too. Total rubbish. You guys at W&W ought to be ashamed to carry that stuff.

You can assemble a decent quality aerox system, but you have to pick and choose. Their regulators seem to be okay and the "glow meter" flow meters (see for instance @ Chief aircraft) seem to be rugged enough (well, two seasons and haven't broken mine yet). The blue silicone masks are okay, but seem exorbitantly expensive for what they are. You'll be annoyed when you spend almost $200 and the thing shows up with a tag that says "return to manufacturer by such and such a date for overhaul".

M&H has their issues too. I had a borrowed EDS system fail (wide open) on me in flight at 14,000. Man that was exciting. I talked to M&H about it the next day, they walked me through some basic trouble shooting, finally agreed that the unit was dead, and not repairable. They don't have any built in back up protection, even in the event that the battery just runs down. Really? On a life support system?

So yeah, I agree with the "go for quality -- it's your life" sentiments expressed by others here. Wish the manufacturers shared them.

Best regards,

Evan Ludeman / T8