Hi, I joined last year and haven’t participated in any discussion. I am 65, I have stage 4 emphysema ( end stage,I’ve been told), pulmonary hypertension and Factor V Leiden ( too much of the clotting factor). I have a Phillips home concentrator and an Activox portable (1-3 liters pulse, I don’t like using it because I focus on the light going on and off while I breathe. Anyone have any Inogen reviews from personal experience? This is destroying me, any advice would be welcome, thank you, Anthony Popola