I have about two years and 55,000 miles on my 2011 EcoBoost and I'm generally happy with it.
PROS: My overall mileage is 18.2, which is about dead center in the EPA rating for my configuration, but not that different than the 5.0. It has all the power I've needed - it has pulled a bed full of dirt and rocks as if it was empty. I've easily exceeded its weight rating (for short distances on back roads) with no problems. It accelerates really fast (but see below). It has been mechanically sound so far.
CONS: It has significant throttle lag, which I have not gotten used to. I driven turbocharged vehicles before, but this lag is ridiculous. It's especially annoying when I need to accelerate quickly in traffic: stomp on the gas and nothing for 1/2 sec, then it goes (like a bat out of hell). I've learned how to anticipate it, but sometimes you need the power unexpectedly and it isn't there for a second. That has been scary.
The horrible throttle response is my biggest complaint and I may eventually get a tune to fix it. Because of this, and this alone, I would not get another EcoBoost engine. If they could fix this, I would get another.
Last edited by Theocoog; 08-27-2013 at 10:44 PM.