While I'm skeptical about the cleaning effects of the machine and damage to the equipment, I'm not worried about the health effects of the ozone produced.
The machine presumably produces a small quantity of ozone to be used in a closed environment when it's treating your mask and hose. It tries to recirculate the ozone instead of venting it to the room air, and has something to destroy the ozone at the end of the cleaning cycle.
Even if it did leak the ozone, it probably doesn't produce it fast enough to be much of a problem when mixed into the air in your bedroom. Ozone breaks down fairly rapidly on it's on in the house.
Many people have deliberately used ozone generators as "room fresheners." While ozone room fresheners are probably useless quack devices, a lot of people have used them without a lot of obvious bad side effects. Even a gadget that deliberately blows ozone into the room seems to be mostly harmless. There are also some electrical devices that generate ozone as a side effect of their operation.
There is also ozone naturally in your breathing air and as a consequence of air pollution in outdoor air.
Ozone is hazardous in high enough concentrations. Unless you're doing something strange, I don't think the SoClean is likely to produce enough O3 to matter to your health.