My review may be premature, as I've only had this item for a day... providing my initial thoughts fyi. The KNKA air purifier is smaller than I expected, but I admit that I didn't focus on the dimensions in the description. It arrives packaged in a very well-designed box, with styrofoam on top and bottom, and the legs, 110v adapter/plug, instructions, and a few tiny filters designed for adding essential oil (1) and something else that I haven't figured out yet (2). It assembles very quickly and easily. READ the instructions, as it has several automatic or manual ways of operating, and the user will benefit by this knowledge. Wow.. this thing is QUIET! I also really like that there are 3 different lighting options, including completely off (for a bedroom at sleepy time), completely on--including a cool "laser" like beam of green light along the floor letting you know from a distance that it is running, and an in-between on/off, with just the buttons lit up, but not the fancy floor light. Did I mention how quiet it is? I also like the "pet" feature, where if you switch to this mode, it jacks up the fan speed for a set period of time to clean out smells (apparently), and then drops back down into the auto mode. I'm not sure how it works, but the auto mode is said to sample room air and adjust the fan speed accordingly. If that's effective... what a great feature. I have a tall but not wide house, with 3 floors. I bought one per floor, but I think to be truly focused on clean air, one may want to install one per bedroom, plus whatever you need for other spaces in the home. The included filters are very high quality, with different layers as described. They fit absolutely perfectly inside the unit and will not allow air to leak in around the filter.