So far rgus product is all that it is advertised to be. Great Product

It doesn't work. When I pressed the customer support on it, their wording changed from a definitive "eliminates 99% of..." to "It is beneficial..." and "it will not not immediately remove" followed with "You must first eliminate the mold/mildew (by proper washing), and the lamp will prevent it from spreading or returning." Thank God I bought it from a place with a liberal return policy!!
Please read my comment to the first review for a fuller story.

The first one we bought wasn't working correctly. We returned it and Amazon fed-exed another one. Thank you Amazon! Germ Guardian wasn't helpful at all. I called their help center to check if we were using it right and the return policy, and never got a call back, which was very odd. They don't have live people answering the phone, you just leave a message.

We got this for the mattress because we think there may be some mold in there. My boyfriend still has his cough, but that's probably because it's cold. So I can't say if it's effective or not.

If you are going to buy this, make sure you can buy it from a place that is very easy to exchange and return, seeing as our first one didn't work.