I think my purifier overall is fine, and the filter itself is fine.  being asked to provided a review...i never compared the filter cost or quality to other potential brands.  buying a new filter every 6 months...seems fine.  not sure what to say about these besides "fine" because an air purifier's benefits seem hard to see or observe directly.  not sure how to evaluate the filter cost and im not interested in doing a cost comparison right now, so this product...is "fine"