I've owned 2 airzone machines for about 3 years...one for water ozanator (XT301) (which I also use to make ozonated olive oil.. IT WORKS GREAT) and another for Air filtration/purifying (XT800).. it two works great....
I am writing this because I use both machines daily... and I've relocated and 'didn't handle gently' the machines.. also I had forgotten to change/use the filter and basically destroyed one of my machines (XT800)... I called the company after two years.. AND WITHOUT QUESTION.. they repaired (basically rebuilt) quickly and returned to me... BOTTOM LINE....THEY BACK THEIR PRODUCT....
If that is worth anything to you.. definately consider going to Air-Zone.