After researching for months, I decided to order two Alen air cleaners in early November. I called to talk to a customer service rep because I had a special request concerning shipping. I wanted to get the filters before Thanksgiving but was unsure of when to order them because I was going to be out of town and I didn't want to miss the delivery. The rep told me I could go ahead and order and he would talk to shipping and delay the shipping of my order. Instead, my order shipped right away while I was out of town. Everything turned out fine, as a friend watching the house brought the filters in before they were stolen. The point is, I didn't need to spend 15 minutes on the phone with the rep who was not able to take of the delayed shipment as promised. The other thing I found disappointing was finding out they had a "Black Friday" sale. I could have saved $150 on my two A350s. Here's how Alen's rep could have guaranteed they'd get a 5-star review: when I call tell me I should just wait another 2 weeks and order after Thanksgiving to save money and get the shipment delivered after my out of town trip. As for the filters, they are fine. I live in the desert with lots of dust and I have dogs. The amount of dust in the house is visibly reduced and my home doesn't smell like dog. The low settings are very quiet. The highest setting is a bit noisy but that is to be expected if you expect it to move that much air around. It actually helps me at night because I sleep better with white noise. Though I don't have bad allergies I am less stuffed up than I was before I bought these air cleaners. I would recommend this company and their product to anyone, just don't expect any personalized customer service if you call instead of ordering online.

My Alen filters, all four of them, are super and quiet. But with one second power blips common, we often find that the filters have been turned off and have to be manually turned on again. It would be ideal if they could incorporate just a few second backup to not not shut the machine down on a power blip.

There were a few minor problems with my order but excellent follow up straightened everything out nicely.

I love the auto ship program... I am happy with my air filter.

Love my Alen 350 air purifiers. The air is cleaned of airborne particles and my house has less dust! Vacuuming the prefilter (just under the cover), once a month, is sure proof of how much dust and particulates are in the air. Thank you for providing an air filter to make my home environment healthier!

I have been a customer of Alen Corporations for 6 years and have always had excellent service for machines and filters. Love these guys!!

Good products and extremely reliable service!

Even if this costs a little more, it's just worth it. Period.

For such an expensive product, it's awesome they have an outstanding warranty. It's even better that they honor that warranty. They make a superior air filter and they back it up with superior customer service. Thanks!