Bests & Worsts Reviews from Amazon

I run this constantly in the basement where we have two litter boxes for two very "productive" young cats. When I started to use it the air did seem fresher, and I really noticed the difference when we were gone and left it off all weekend! The illuminated display is easy to read and understand, and the controls are straightforward. The fan has 5 speed levels; on the lowest one you can hardly hear it, and it's not even very noticeable on medium speed. The unlit flat touch-buttons are for power, fan speed, UV on/off, and an optional 1-8 hour timer (after which it turns off). There's also a recessed reset button for the filter reminder (it's easy to remove and replace the filter). I measured the power usage with my little Belkin power meter - with fan on max and UV on, it's 63 watts; with fan on the lowest setting and UV off it's 33 watts. So running it all the time shouldn't be too costly. When the UV light is on a blue strip around the top lights up, and there's a slight odor of ozone (which I don't find unpleasant, but which might not be healthy to breathe all day - but that's what kills the germs). If you look into the front grill at just the right angle, you can see a little bit of the bluish UV light (probably not a good idea to stare at it for long). The only negative is that for the first 2-3 days, there was an odor kind of like a combination of a blown-out match and a plastic chemical smell. But since it didn't really smell like melting electrical parts, I waited it out and it went away eventually. And as others have mentioned, the air it blows out goes off mostly to one side, not straight out. But that's not a big deal for me since it's just sitting in the middle of the room. P.S. Now that I've had it for a while I'm still very happy with it and it's working fine. I did notice one minor issue which may be a bigger deal for some people - if the power is lost while it's running, it'll stay shut off even when power is restored - you have to press the on/off button to start it up again. UPDATE: UV LIGHT LIFETIME This isn't in the instructions... after about 9 months the UV icon on the display started to blink. I contacted the manufacturer and they told me this means it's time to replace the UV light tube. Apparently even though the light is still visible inside the unit, over time it loses effectiveness, and I did notice less of an ozone odor by then. I haven't replaced the tube yet, but you can stop the blinking by holding down the UV button for 5 seconds.