Worth every penny
I had 2 and in our house I noticed the mold/mildew was gone in the 2 rooms I had them in yet some times the rest of the house had a old stale smell... hard to explain so I purchased 2 more!  I have 6 rooms total in my house and by adding these two units the house smells fresh & clean all the time!  I have not had to replace any of the bulbs yet and I've had 2 for over a year!  I am so pleased with this product!!
Rating: 5 stars