[glasshouse]

Careful, your vendetta is showing. I doubt a refund will satisfy your thirst for a moral victory. It's unfortunate.

Oxygen concentrators are hard to come by. Jack said it himself. There aren't very many companies selling them, either. At least Jack does make things right with his customers, even though his time frame is frustrating. There really aren't many options, looks like you might make it even harder to buy a concentrator. Jack sells a great product. It's too bad your patience wore out, because you won't find a better concentrator for the price. Have fun lugging tanks around for the rest of your beading days. May you feel morally victorious every time you have to swap one out.