Well, it kind of looks like a refrigiratore on your back. It's semi closed, "I think", it's real expensive, it's ugly, it take 3 friends to help you put it on. Now that we have the pro's out of the way. I'll think of some con's... Nope couldn't think of any. "Get a Buddy Insperation", it's less expensive, it's closed circut, it can do mixed gases, it weighs less, and you can put it on yourself.