I have two, one in my bedroom and one in the front hall bathroom used by guests. They are never turned off and give a soft lovely glow to the room. I DO know that they do "something" because my bedroom has an atmosphere of calm that no other room has, except the front bath.
They never gather dust.

Have had one for years in living room, have not noticed any benefits...its a nice night light...

They change the energy in a room with the release of negative ions. We have one and I love it. Bought one for my in-laws as it was always so dreary. Even on sunny days, just being there an hour, I was exhausted. So I gave them one for Christmas and it has drastically changed the energy in the house. Much lighter now.

We have one in the living room on a table at the back of a couch.....it is on all the time and doesn't seem to bother either the dog or the cat...

It is touted as an odor killer among other things. I have one in a spare room I use for watching TV sometimes. I am (unfortunately) still a smoker and there is no smoke smell in the room. Wonder if it would work in my kitchen for cooking odors??? Maybe I will try that....

Thank you for bringing my attention to salt lamps. Just ordered one for my daughter for her birthday which is April 30th. She really likes natural things.

It made from pieces of HImalayan slat crystal, with interior decorations and act as natural sources of light. When you place a Himalayan salt lamp in every room, the home can reap several health and environment. It will balance Electromagnetic Radation. Himalayan salt lamps emit negative ions and cancel out positive ones. http://www.jpost.com/PromoContent/5-Amazing-Himalayan-Salt-Lamps-You-Can-Buy-Right-Now-441101

Have had one for several years, the light bulb just went out. We like it but don't notice any difference either.

I have a 3in thick slab of this for cooking meat/fish on top of. And fine ground is our table salt of choice. I have thought about getting the lamp but haven't found the right one just yet.