New filters just received. I've only vacuumed a small area once so far, but I find the suction power better. It smells like new filters. Not bad, clean scent. I don't remember smelling anything while vacuuming. I have no idea if that means my last few filters were THAT old and gross or something. To be honest I have had a vacuum for many years and vacuum quite often (I have pets) and I have never changed the filters. I honestly never really thought about it. Of course, I clean the canister regularly, but I never thought of filters. Probably a terrible thing. But now I've changed them! These fit perfectly. I have a shark navigation system. nv351. Just throw away the old filters and just install the new ones. No problem. I also threw away the front hepa filter and put in a new one. It's as simple as it gets and fits perfectly. Also excellent communication with the company. I love supporting small businesses. Delivery of excellent product and good communication. I strongly recommend doing business with these people.