My neighbor has two beagles and a cat that would otherwise have me sneezing as soon as I entered the house. But she also has an Ionic Breeze. Not one of the cheap rip offs, the real ones that you can only get through sharper image. I didn't realize the difference until I went to her house to feed her animals while she was away. She had turned it off for the duration of her trip and the change was immediatly noticable to me.
I also have friends who live in a small apartment in NY with a very fat, lazy old cat. They both have allergies, but got an ionic breeze and have no noticable symptoms.
Its truely amazing.

Pros: Almost completly stops allergy symptoms

Cons: Expensive!

I have 8 pets of my own plus whatever rescues are staying with me at any given time. Its important to have something that helps keep the air fresh & smelling clean. This is that something. My in-laws even commented that they would never guess that we had a houseful of animals by the smell...and they'd tell me if they could smell anything! It cleans the pet dander out of the air too which is very helpful for those with allergies & other respiratory problems. I also have cats who have allergies & since getting these, they sneeze a lot less & have fewer trips to the vet.

Pros: cleans the air, collects dander, makes home smell fresh

Cons: none

I purchased mine on ebay and saved hundreds. Okay, I tried it and wow! It really works. Wait until the first time you clean it which is really easy. The dander and dust that it collects will amaze you. Diminishes odor and allergens in the air. It really works and I thought that it was a bit "gimmicky" at first. I was wrong.

Pros: works to minimize allergies

Cons: none noted

This thing really cleans the air especially if you have pet dander flying around. We found it cheapest at Walmart.

Pros: works great

Cons: none

Love this product! It is so quiet and very easy to clean. It keeps air clean and decreases dust and pet dander!

Pros: works well

Cons: none