I'm going based on my own experience, I got the EcoBoost and had buyers remorse right away, it was definitely the could've had a v8 type of remorse, I mean the car was fun and all but coming out of a rs4 I just couldn't do without the v8 sound and power. well I ended up taking the the 4-5k hit...
Black 2015 EcoBoost, picked up from dealer on 11/29/2014. Wanted to get the GT but with my commute (about 95miles a day) the money saved on gas is going to be more important and this car is fast, definitely gonna tune it and do some bolt ons