Fantastic customer service. New replacement filters were purchased from Dyson in February and didn't need to be replaced until July. Realized I had bought the wrong size 6 months ago and contacted the seller to see if they would be kind enough to exchange it even though we were FAR outside of our returns window. The seller responded immediately and sent new filters! We've been using the filters for a couple of weeks and I don't see any difference between these filters and the expensive Dyson filters. We are very happy with this purchase and will be buying from this seller again!