My bedroom is next to a badly waterproofed bathroom and I get mould on a wall which I frequently need to clean, and dank air that I must have a window open to ventilate, which is very cold in winter.
Bought this and ran it for a few hours, already feel the air quality and moisture has improved. Looking forward to keeping the mould at bay.
The device is small and very portable, and of good quality build. I chose this as I was unsure what my solution would be and didn't want to spend lots on a branded device; I think this is already doing a great job.