After considerable research we found the IQAir HPP to be the best on the market and chose to buy it. After further internet searches we found the best deal in Canada at Aquafresh Solutions, although we live on the west coast with many dealers much closer. Ordering was a breeze, the staff very helpful, and our unit arrived a few days later in perfect condition. Aquafresh staff also followed up to make sure there were no problems (there wasn't). This high-quality unit works great and we are very happy with both the product and the service we received. It's not a cheap air purifier (been there, done that) but it's worth every dime if you value superior air quality in your home and we highly recommend it and Aquafresh Solutions.