The factory Motorcraft batteies lasted about 5 years for me.
I hate to rain on everyone's parade when it comes to battery brand loyalty. But there is a lot of truth to the statement "they're all the same" when it comes to batteries.
Back when I was traveling around doing industrial testing, one of the places I used to go to was a AC Delco/ Delphi battery plant in Olathe, Kansas. During the course of the visit there, I saw a lot of what was going down the production line. The batteries going down the line never changed, but the labels did. There were about a half dozen different brand names pasted to the sides of the same batteries. It's been long enough where I don't remember all of them, some were better known and some looked like "house" brands. But I do remember Sears Die Hard was one of them.