This is the type of product I'd never have considered buying until happening upon it by chance on Amazon. It was our first winter in our modern two bed house last year and we suffered condensation on windows badly, leading to the frames suffering a type of fungal growth which wasn't pleasant and risked rotting the wooden frames. After reading about the DEM10 I was keen to try and have now been using one for the last 3 months. It makes a huge difference and the proof it is working is visible from the water that collects in the tank, and the lack of condensation on the windows. The unit is relatively compact and sits on our landing in order to have a central place in the house. The water reservoir is easy to remove and replace, and can have it changed in 20 secs. Normally it's on for about 6 hours a day and requires the water to be emptied every other day. The unit is quiet with only a small hummmm eminating, I don't thing you'd want it on in a bedroom while sleepng but the landing is fine for us. I'd be interested to know the energy consumption of this unit but suspect it isn't huge having seen my last energy bill was less than expected. Overall very happy with this product and would highly recommend it.
Update Oct 2010: Still going strong. Recently got an Owl electricity monitor and it tells me this uses ~0.35kwh which seems pretty reasonable to me
Update Nov 2011: Still working as well as it did day 1