I have had my Sharper Image Ionic Breeze units for several years(8-9). YES they do remove gases, odors, smoke, and tiny particulates to some degree. We have a large one and smaller one. When we smoked cigarettes, stopped a year ago, THANK YOU GOD, it did a good job of removing the smoke and odor. They do a poor job of removing pet hair and larger dust particles.
YES, they are easy to clean and have zero cost after purchase. For me, I like the ozone and what it does for odors. One now permanantly resides in our Airstream and is plugged in on a fairly constant basis. The other is in a section of the house, that we use as a sun room, video editing studio, and home theatre. It is truly a dust magnet. the room has a hardwood floor with lots of shelves and MUCHO electronic equipment. We took the carpeting out and put the breeze unit back there perhaps a year ago and it is a LOT better with particulates and dust coatings.
A CARPET IS A TOTAL DUST PRODUCER>>>>>>>GET RID OF IT
My best guage is the shaft of sunlight test. Is it clean and clear when you walk through the room or do you see particulates. Typically the Ionic type units will always allow you to see the dust.
Yes, they are fairly easy to clean and have zero operating cost after purchase.
NOW, my recommendation based on experience is:
Air Purifier | HEPA Air Purifier | Home Air Purifiers | Rabbit Air
We have the bios gs unit operating for going on a couple of years. Excellent service by the folks at the company, washable filters, decent price, and FILTERS THE DUST AND PARTICULATES. Yes, it takes care of odors, automatically adjusts to conditions with different speed levels sensing the air, particulates are vastly reduced, passes the sunlight shaft test with 95% gone, removes the border collie stuff that is in the air from our 2 BC's that come in during the winter, and does a good job on the particulates and smoke from the wood stove going full blast all winter. Yes, it produces ozone if you like it; but one can turn it off.............
I can go on and on; but for me...........ITS THE WAY TO GO........I want another; but don't NEED it....................God bless.........Dennis