Definitely works well for particles in the air
I've installed a couple of these ion generators in my kitchen.  I am impressed that my fried bacon odor is generally gone about 2 hours after I'm done cooking.  Before I installed these, the odor would remain 4-5 hours or longer.  As shown in the demonstration with cigarette smoke in a chamber these do work pretty well with larger airborne particles (one that are visible for instance).  For other odors that maybe don't have larger particles I'm still on the fence how much they help.  I noticed that when I've used the spray can air freshener in the bathroom, where I have a couple more installed; the air freshener fragrance disappears much quicker than it used to.  However, as far as just making the bathroom smell "cleaner"; I don't think that's the case with just these units.  I also use an AirtheReal air purifier unit at times and I have noted that the filters do get dirtier faster since I've added these ion generators.  So, given the low price per unit and the very small electrical consumption I think they are helpful if you have the larger particles (like smoke) in the air.  At some point in the future I'd like to get one of the ion testers to see how many ions are generated or how far away these units are effective.  Although some web sites comment about touching the carbon brushes will give you a light shock; I'm not interested in checking the units operation by doing that!
Rating: 4 stars