I have not had too many complaints with my 2009 5.4 3V with the 6 speed. I drove a 2006 5.4/4 speed, and hated it. I've towed up to full size blazers with it, and it does well, not a huge HP motor, but good torque.
That being, I have noticed twice in the last 2 months a stumble when extended idling (once in a drive thru, once in a traffic jam) that seems suspiciously like a misfire. Any info on 'dropped coils' in these?
I would love to trade mine in for an Ecoboost. But I will be holding out for the redesign coming up.