Let me start by saying that if you're looking for a more affordable alternative to the pricey Lennox Y6604 PureAir filters, this 3-pack is worth considering. I've been using these for about three months now, and here's my honest take.

The Good: The air quality in my home has noticeably improved since installing these filters. They capture a lot of dust and allergens - my allergy-prone family members have definitely noticed the difference. Installation was a breeze; they slid right into my HVAC system without any fuss.

The Not-So-Good: As other reviewers mentioned, these aren't exact replicas of the Lennox originals. Mine were slightly shorter (maybe 1/4 inch) but still fit securely in my unit. The packaging could definitely be sturdier - one of my filters arrived with a bent corner, though it still functioned fine.

Value Proposition: At about one-third the price of genuine Lennox filters, these offer excellent value. While they may not last quite as long as the originals (I'm expecting to replace them around the 10-month mark), the cost savings make up for it.

Final Verdict: If you're okay with a non-UL-listed alternative that performs nearly as well as the original at a fraction of the cost, these filters are a smart buy. Just be prepared for possible minor sizing differences and less-than-ideal packaging.