It is hard to review when you haven't used any yet. I have taken one out of the box and it looks okay. I don't know how good they are yet or good they fit my furnace. If I think that they are that good, I will not buy anymore.
The purchasing process was easy. Selecting which filter I needed was excellent. All the filters were grouped separately and it was easy to select the right one. The process was quick and effortless.
The service is great so great in fact that i received a second filter 4 days following the first one. I would guess that a 3 months sequence means something different than I anticipated.