I currently own, and am very happy with, the medline oxygen concentrator. Its definitely restored breath to my body. I like the sleek lines and a stature that is small & unassuming. I prefer the fact that it is continuous and not pulse activated. My only regret is it is very difficult to make replacement tubing purchases; because they are perpetually out of stock. This is very serious for me, because I am allergic to plastic tubing. I can only use silicone tubing. I also have been wanting to try their TENS Unit, but it too seems to always be out of stock!
