I've owned an IQAir GC MultiGas Air Purifier with PF40 Coarse Dust Pre-Filter since May 2017. It has been an excellent product sold by a very professional firm. Their initial help in choosing the right model was excellent. The IQAir is brilliant at removing smells from my kitchen/family room [I have indoor cats] and the filters have lasted well, with only 1 replacement needed so far. My only wish is that IQAir made a product that can be controlled by the Amazon Alexa. It's unlikely such control could be retrofitted but that would put the icing on the cake for me. I can only hope such a model comes on to the market. Meanwhile, if you want to buy the best air filter manufactured *anywhere*, just use Allergy Cosmos to fulfill your needs.