ONLY works if area starts out with low humidity. Need to exchange humidified air for fresh dry air to keep cooling. Phase change from liquid to water-vapor absorbs heat from the air (localized ten-fifteen degree drop). CAN be a life-saver in dry season, dry country.
For some reason, one of the local channels advertised this constantly last summer. Never mind that New England is known for humid summers.
I’ve had two of these and really like them. You must be nearby to the device to actually feel the effects. I have one on my desk during the day. I also use it at night to blow on myself while sleeping. As previously mentioned, you need to have low humidity for the unit to be effective. If you enjoy a fan during the hotter parts of the day, this would be the equivalent of a small personal fan with minor cooling effects. You can get the same benefit from putting a small bowl of ice between you and a personal fan and you will get similar cooler air.