Works!
I got this for my sister who is allergic to EVERYTHING including my pet dog.  When she stayed with me I put it in the guest room 2 nights before and shut the door.  She said it felt like she had a little sanctuary because it's the only place she's not itchy or having a runny nose.  The noise is like white noise, and she said it didn't bother her at all.  Trust me, if it works for someone this allergic, it will work for you!
Rating: 5 stars