Was about 6 months and so far very satisfied. Only to take it back to find out there isn't a single aftermarket Heppa filter replacement manufacturer. Seems to be stuck with $10 a piece OEM filters! If I had known I was scared I would have tried another brand for that reason alone as you can find the same filters as 3 or 4 for the same price from other reputable manufacturers. This is a deal breaker as I live in the SW desert and have to blow out the air compressor after each use as that collects a lot of dust (which is great) but for that reason I like to stock up on extras.