The page linked gives no information without clicking on unlabelled buttons. Maybe this is a Dutch tradition, but I'm reluctant.

I see a warning flag in the: NATIONAL PRIZE WINNING INVENTION AS SEEN ON TV. In the US that normally means "the only information available is what we say in our ads."

It may be a good enough system, but I'm not gonna click blind buttons to find out.

The most common humidity "reducers" use some form of cooling to a sufficiently low dew point to wring the moisture out of the air. Units are available that attach to a central heating/cooling system (best used with forced air systems) and also as stand-alone/roll-around units for smaller room-sized areas. They're quite commonly available, in-season, from local suppliers in my (US) area, and models from major appliance suppliers seem to be of fairly consistent and acceptable quality.

I haven't heard of any new miracles changing the laws of physics to make the few other kinds of "absorbers" etc competitive with the refrigeration/reheat kind. I'll wait for someone's description of why this one is "different."

John