I ordered the Sharper Image PURIFY 9 Whole Room Air Cleaner with True HEPA Filtration, Activated Carbon Filter, Visual Air Quality Indicator, for Home, Bedroom and Office when my dog and I seemed to be experiencing some mystery allergy symptoms and this thing has been a life saver. It's so easy to plug it in and start using it. The touch screen is so intuitive to use, even if you haven't glanced at the instruction manual. Here are some pros and cons of this unit:Pros:- Works amazingly well. Eliminates odors quickly (I've used it in a freshly painted "stinky" room, have used it in the kitchen when food was burned and the place was full of smoke, etc.)- Easy to use. The touch screen allows a user to quickly set the desired level (higher power is a bit louder of a fan noise, but is a stronger faster method of filtering air.)- Auto mode let's me see just how "dirty" the air is, and allows the machine to adjust to the needed level to maximize air cleaning and then save power by reducing itself to a lower level automatically when stronger filtration is no longer needed.- It really seems to help with my allergies and my (and my dog's) respiratory issues.- Night mode is incredibly quiet and the lights on the screen auto-sense fo turn off when the room is dark and back on again when the lights in the room are switched on. It's so easy to use this in the bedroom while sleeping. Almost no issues with feeling disturbed or falling asleep.- Coloured light up ring changes from green to yellow to red to show a visual representation of how dirty the air is that is entering the machine.Cons:- The machine itself is quite large and takes up space. I haven't really found a good place to store it so I just keep moving it around the house from room to room.- The fan sound gets loud when it's functioning at a higher power setting. There was one night when it was set to "auto" and my husband kept farting all night. This thing kept switching to a higher power setting and when it did that, the sound would briefly wake me up. Then eventually it would switch back down to a lower (quieter) power setting... and ultimately he would fart again and the machine would get louder again and wake me up just as I'd fallen asleep.- The main ring light turns off in the dark in night mode, but the smaller lights on top stay lit. If you're as sensitive to light as I am at night, you may find this disturbing if used in the bedroom. I have to either hide the unit behind furniture or else throw a sock on top of the screen or something so that the lights aren't showing while I sleep.Overall, I'm really happy to have this. The day my husband decided to smoke a turkey in the kitchen ?, this was a real lifesaver and helped to get the smell put. I'm actually surprised by how much use my family gets out of this machine. It's fantastic and it works well, and it seems to really help with respiratory sensitivities and allergies. I placed it next to one of the ducts in my home in spring when we first turned the air conditioning on, and this machine went nuts. That's how I learned we had mold in the ducts. Overall, I would absolutely recommend this to anyone. It works so well and it's worth every penny.