I've had some better experiences lately, I've been commercial at autozone for awhile now, and let me tell you, the commercial treatment is WAYYY better. The other day I went in to get a battery and one of the guys I'm whicked cool with was like "hey don't get that, check this out" He walked me over to the pile of core batterys and shows me a red top optima and says "Somebody brought it in as a core & it tested good, that was a few days ago, lets check it again" So he tests it, tested good and gives it to me for free!! I pull my car into the shop and use it for the radio almost everyday, I can bump it for 4+ hours and it will fire right up

Feel bad for the idiot who brought a good optima in as a core, I cleaned it up and it looks brand new.
Now that my new shop has a Napa 2 seconds away I use them ALOT more though, way way better parts and very knowledgable counter guys, however a few months back I had the SAME experience, they swore up and down that the non-turbo pt cruiser waterpump they were selling me was the right one, if I hadn't read about it online I probably would have had a major problem on my hands since they can interchange but using the non-turbo pump will overheat.