I run regular only in my Explorer Sport. I have put in 1 tank of premium in almost 9000 miles. Not so much as a hiccup. Temps have been upwards of 100 here already, also, and we live in the mountains, so are regularly doing hard pulls.
I think that there is a small and vocal group of people who have had quite a few problems with their EB F150's. However, I would also bet that if you were to look at the percentages vs numbers sold, it is not any higher than any other engines out there. There are ALOT of these engines out there. That is not to say that the people having the problems do not deserve to have their issues fixed. Or, that Ford should not be constantly looking to improve the package. However, it is obvious that they are doing just that.
I also think that there is a contingent of people that are so anxious to see the EB fail, due to some sort of weird V8's only mentality, that they will grasp at anything to try to prove their point that turbo V6's don't belong in trucks. Frankly, this has been going on since Ford announced the engine.
The reality being, if a manufacturer could get 2 gerbils to produce the power that people wanted...................... people would buy it. Short of the diehards, the vast majority just want great throttle response and good mileage. How that happens..................... they don't really care.