Just talked to Jack and you are absolutely correct. The unit itself is not brand spanking new. They get used Millenium units made by Respironics. They completely rebiuld them. This means new seive beds, new compressors, new switching valves... any thing they need currently or that would need to be replaced is done. Any parts they put on are new, so all the important "guts" are new. I am so stoked to be getting two next week to run on my new Cuda... should be a perfect match!