I purchased these prior to needing them but the price looks good and they look sturdy. I tend to change my filters every two months even though I have no pets but I do have allergies. If they hold up--I intend to put two of them in at the end of the month--I may get them on auto-renewal.
Says Merv 11 last 3 months, mine barely get 2. I have 2 dogs, 1 indoor/ outdoor cat, cook a lot (near the return) and live on a dirt road, so maybe my situation isn't the "norm"??