-The Processing is ok for the price, only the imprint "Off" at the On / off button was not firmly and wiped within 5 seconds with the naked finger.
-Much Performance, even on Whisper. But I think too much. I have the device always switched on only very limited in time. The ozone smell is quite strong, recommended a regular ventilation. I primarily have him at night in the bedroom walk in cracked window.
-The Volume is alright, I heard the hiss in a silent room (bedroom) in several meters away. Asleep anyway was not a problem;)
Actually I was satisfied with the device. Not outstanding, but solid.
Unfortunately, there can no longer be off after less than a week, because the switch is defective. Whisper and Turbo mode but are not adjustable. It goes only by pulling the plug. Therefore, I have now returned there and looking around for something wertigeren devices.