Effective despite the negatives.

After reading the comments, I would bring my experience with this product.
On cleaning, very simple. Use a liquid descaler intended for iron or steam plants. Set hot water (tap water) in the tank (1 third). Put descaling agent in proportion to the amount of water you put in the tank (see dosage on the product). I have paid three quarters of a bottle of 250 ml.

Then rotate the camera at least 2 hours. (Humidity range set to maximum) The effect is radical and without rubbing.
Side Effects, a little smell of vinegar (the product) and mist invade your room. So choose the place you want to clean it.
The device can indicate from humidity higher than 90 at the start and therefore to stop, but he will go down and the unit will restart.

For those who complain about the erroneous display of humidity in normal use, know that limestone alter the measure, and also reduces the steam flow.
When the cord is too short, there are extensions ...

For me, the only real negative points are:
Loss of settings when you plug the device
Handling impractical tank.

I have not seen for myself leaks.