Looking at 2013 F-150 EcoBoost - any concerns?

Here's my 0.02. So far over 10,000 km of towing through sun and rain and no issues. Don't believe all the hype about the fuel economy, but I'm not disappointed with it. I look at it this way - you get the power of the 6.2 with the fuel economy of the 5.0.
There are some issues that could bite you, but no auto manufacturer is perfect. Sign up to one of the Ford forums and be aware of them so you can solve the issues as needed.

Good luck!