AquaSun products are as good or better than any other inexpensive small ozone units on the market. There are a lot worse out there in cyberspace. I have heard several horror stories from people who bought bargain brands and had them fail in a few hours of use. That has not been the feedback I've got about AquaSun products. Sure the odd one has a flaw, but the company is very quick to make any problems good.
As for health benefits from breathing ozone, I have never really had any major health challenges to deal with, so my use of ozone has been more preventative than curative. I look at it this way. Because of the jet stream there is no such thing as pure air anywhere on the planet anymore. The EPA and other environmental agencies all tell us that indoor air is more polluted than outdoor air for a number of reasons. Dis-ease is about toxicity of the body to a large extent and many of the toxins are introduced through the air we breathe. If we choose to purify the air we breathe indoors with ozone, we take in less toxins for a significant amount of our life on this planet. Less toxins equals less dis-ease or at least a greater chance for the natural immunity of the body to deal with toxins and microbes. drinking ozonated water makes sense because it is an easy way to get an increased amount of oxygen into an otherwise oxygen starved body. Unless we are doing aerobics and/or deep breathing daily, I think we are all oxygen deprived on this planet at this time in history.
My 2 cents worth