The upside is that they were delivered in the dimensions I ordered. I do not have a HEPA testing facility so I can't comment on the effectiveness in use, but I can say that compared to the last filters I had these seem ... shoddy.It may be minor discrepancies, but the cardboard felt like it was thinner than the previous filter and the pleats in the filter were irregular rather than the each pleat looking the same consistently. The first one was loaded in to the furnace, but I won't be ordering them again.These filters work great. I had a hard time finding filters at the home stores in the two inch thick size. I found these on Amazon and for a great price. Much cheaper than the one style I found in the store. They do a great job of filtering the dust and dirt. I find that I am dusting and cleaning less than before. Which is really nice :)Same as the other reviewer, couldn't find these two inch filters anywhere. A significant decrease in dust throughout the entire house. Great product and will continue ordering these because they are a definite value.Great product fits just fine.