We have five EB F150s at work. 3 short beds and 2 long beds. All crew cabs 4x4's Lariats with 3.73s and to date no we have had no Ecoboost related repairs. Matter of fact I think other than mine going in for recent warranty work for a noisy Pinion Bearing, none of the other have seen the dealership since they left the lot. So far so good! We also have a one 5.0 that I've been impressed with thus far (has less than 5k miles on it). Decent power and the fuel economy is every bit as good as the EB's that we have. I think ford hit a grand slam with the current engine line up as all seem to be very good (3.5EB, 5.0, 6.2, and the 6.7).