I've just had this about a week, but so far I'm really happy with it. I have extremely sensitive hearing and couldn't use my old humidifier at night because the slightly unevenly rotating fan created a bit of a whining noise that I couldn't sleep through. However, this one seems perfectly even (so far at least), so even at fan speed 3 (out of 4) it's just a simple innocuous white noise. It's also not very loud at speed 3, kinda loud only at speed 4, and suuuper quiet at the lower speeds. The only drawback is that the reservoir doesn't hold a lot at a time below the max fill line, so I have to refill it a couple times a day. However, the side opening makes it handy (you don't have to take it apart to refill it). I just keep a pitcher next to it so refilling is not a big deal. Also, \"sleep mode\" turns the LED display off but also turns the fan speed way down, so I've just been placing a small object over the display to sleep at night, which works fine. I live in a drafty old house with forced-air heat, and now that it's getting really cold out, this is really being put to the test. So far, I find that it can keep my 200-sq-ft bedroom at around 40% humidity (or high 30s) on a cold day, and up to 50% on a milder day, at fan speed 3. (I haven't tried speed 4.) I wouldn't want to try to treat more than one room with this little humidifier, but it's a good choice for this size of space.