I don't know about longevity, but I test drove one in a crew cab short bed a few weeks ago. Thing ran like a scalded dog! I mean it would move out and right now.
I've driven just about everything ford has put in a pickup in the last 20 years, and this was the most responsive and peppy feeling motor I've seen in a 3/4 ton pickup. Of course I didn't tow anything and the truck I was driving had a 3:78 rear end, but I'd bet it would pull the house down as far as gassers go.
