Renewed with Inogen (5 yr renewal on medicare), they sent me a new portable, but didn't replace my home unit with "new" concentrator, is that normal? Said don't replace that one unless I have problems. The portable is newer than last one, because this one goes up to 5, last one only went to 4. (Told me then that I'd have to buy one if I wanted to go up to 5, that all medicare ones only go to 4) Nice to see they changed that!