The filter has less folds comparing to 3M and this decreases surface to filter, need to buy more frequently. Also brand name has their folds more organized and spaces evenly nicely. Bought top quality Merv 13 rating but I am not even sure I got it, filter membrane material is felt less dense than brand for the same rating.Only thing is that they have lot of sizes for all openings.
My disappointment was with the size of the filter. Silly me, I thought 4 inches meant 4 inches. No, in this case its only 3 5/8 inches. AND the filter I was replacing (also marked as 16x25x4) was actually 4 3/8. So the new filter was a bit loose in the filter receptacle. So, a warning. Check not only the marked size of the filter, but the ACTUAL size.