I've been suffering from post-nasal drip since moving into my new rented house, as my room has a lot of soft furnishings. Compared to the other reviews i read, this seemed easier to clean and wouldnt have to worry about buying new filters etc. I've used it for a few weeks now, and i do believe it does 'lighten' the air.
My housemate tried it and felt the same thing. The water does get really cloudy and i can see specks of dust in it, I assume its all the dust in the air? But i would say its ideal for the price and the convenience of cleaning it! It's pretty too, it has changing lights, the sound is as one put it, 'like having a washing machine in the next room' but you get used to the white noise i suppose. I specifically asked for a white one, because the fine print says they will choose a colour at random, so I recommend if u are particular to email them! they were very compliant with my request. Yeah and my postnasal drip IS getting better, but hasnt totally resolved. So yeah if you are looking for a cheap, pretty, purifier go for it! :)