Filter buy seems to be the no frills choice and best bundle for the price. I like others, received unmarked filters. I am hoping that I am receiving what I am paying for as I selected the best merv 13 rating.They are working. I can see in a month's time that that filter has slowed the amount of dust in the air and has kept my air purifier light on green the entire time. I will continue to purchase as long as the prices stays competitive.
If I could actually know what I think about your product after this short of time Id be happy to give a thoughtful response. It might be better if a response came after a couple of more.
We just received our new filters, so we don't have much to say, except that our Heating and Air Conditioning company recommended them highly and we are expecting to have great results.