I think that Wix products are excellent quality.
I've been a regular customer of filter1 for a while now and have been really pleased with not only the pricing and quick shipping, but especially the availability for whatever we own, tractors to atv's. It's at least an hour's round trip to the auto parts fro me, so much more convenient to order in quantity to have my own in-house stock (like all good BITOG'ers).
Really good score on the Wix air filter for my Kubota tractor: dealer cost $37, online $28, filter1 $14. You can also get the cabin filters (fresh air filter for the a/c system) that are on some cars.