Product review (4 stars): Nicely priced replacement, although annoying to install
Not much you can say about a filter, but I'll give it my all:
The Good:
 Price is great here, 2 filters for the price of 1 compared to other sites
 Fit our old-as-I-am Carrier system perfectly
 Filters as well as a paper filter can filter
 No annoying packaging to saw apart
 Last for a couple months, so you don't have to replace super often

The Bad:
 Kind of annoying to install these accordian type filters, but I'm gradually learning to get better at it. Takes about 15 minutes or less
 You need to have patience to install these; it's easy to lose it and Hulk smash these if you haven't done it 1-2 times before and know what to expect

Overall, I'm quite pleased... fits perfectly and works. I previously bought from DiscountFurnaceFilters, which now charge this price for 1 filter, not 2. Much better deal here. As I didn't have an option what filter to buy, this was it. Like I said, the only downside is the tedious process to install them. You basically have to insert each ridge into the furnace's holding tray rack one ridge at a time, yet make sure they don't pop out as you do each next one. Hard to explain, but this does what it's meant to. Recommended as an alternate option than buying straight from a heating/cooling company.