I did buy it at the price of $80. Turned it on, it seems to run fine, no warning lights, very quiet. I did look at the filter, but as it is enclosed, there's not much to see. You can feel the air coming out, but i have no way to test the oxygen percentage of course. The seller said his grandfather only had it a very short time before going into a nursing home, which accounts for the very low hours. All in all, I'm hopeful. Every other used one has been more than double the price.
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