We just traded in our 2008 Edge Limited for a 2012 Edge SEL with the EcoBoost a couple of days ago. So far, we love it. Still on the first tank of gas and we're averaging about 23.5 mpg with mixed driving. Engine performance (acceleration) seems really similar to the 2008's six cylinder.
The 2012 we bought came with 20" wheels. I wasn't crazy about them at first, but they're starting to grow on me:)