This is an excellent case in point. Even the cheapy units can give you benefit. Your testimonay and others have shown that "any ozone is still better than no ozone at all". Just ask Gaylen, who's wife was cured of cancer and all they had was an innexpestive ambient air ozonator. I'm all for the medical grade units and I think every household should eventually own one. But the fence-sitters can gain benefit even from these little innexpensive units.