I bought a Mountain High EDS Model D1(Electronic Delivery System) at the Lancair Open House.
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If you have not tried oxygen you ought to.  We have been flying with oxygen for years and enjoy the smooth cool air in the 12.5 to 17.5 altitudes and lack of traffic .  Plus we feel fresh as a daisy after flying several long legs with plenty of ox to ward off fatigue. 
 
Steve Colwell       Legacy    N15SC reserved

I have been using the MH Electronic unit for the last 3 years. I fly cross country a lot at 14 to 16 k. I have a 10 ft^3 oxygen container. I filled the container last in March of 2002. The container is still about 1/3 full.

I believe that the Oximizer increases the time between refills by about 8.
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Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp.
248-478-4301, mailto:lorn@dynacomm.ws
LNC2, O-320-D1F, N31161, Y47, SE Michigan