I've been using the SoClean for about a year, and I love it. I have severe environmental allergies and am on 4 medications including an inhaler. Some have mentioned the residual ozone smell. Here's what I do and this works great:
(1) I have my timer set to run the SoClean in the morning.
(2) When it finishes (2 hours later... green light), I take the mask/hose out and briefly turn on my CPAP (ResMed AirSense 10). Once it starts up, I immediately turn it off and the blower automatically runs softly for a period of time (this is the normal function anytime this CPAP is turned off). This circulates air throughout the machine, water chamber, mask, etc. By the time I use the machine again, it is totally free of any ozone odor.
I've read all of the negatives of ozone. Nevertheless, I feel comfortable with the method I'm using now. Hope this is helpful.