Up until last weekend, I've been a die-hard AC Delco user, mainly because I mainly drive GM cars and figured if it's good enough for OEM, it's good enough for me. I bought a Dodge Dakota and have been using AC on it too, partially because of who makes Mopar filters and partially because they're so darn expensive even at the auto parts stores.
Last weekend, I started using my bargain Quaker State filters from Menard's. No problems with AC or anything like that, but at $1.75 (on sale in December) for a rebadged Purolator, I couldn't pass it up. I've got some AA and SuperTech filters waiting in the wings for future changes.