To the OP and anyone that might come across this thread in the future I purchased and continue to own a 2011 (first year) f150 Ecoboost. It has approx 40,000 MI on it and I have never experienced the shudder/loss of power issue. No Ford fix or flash has been applied. Up to this point I am extremely happy with this truck. In fact the only thing that's been done is routine maint. The worst thing about this truck is the SYNC system (tons of threads on this). I always try to fill up with Top Tier gas. The truck I had before this was the 6.0 F250 Diesel riddled with problems (Mine had every one). Other than the obvious weight ratio difference (stability), this truck pulls as hard or dare I say harder from the start than the f250 did. As others have stated fuel economy will not be better than 10 mpg towing. I've experienced as low as 7mpg with our previous camper and this truck, but yet to tow the new camper far enough to judge.
It's easy for people on a forum to say just get a bigger truck, but the costs associated with owning and maintaining them will go up. Two larger more expensive batteries, bigger more expensive tires, shocks, brakes and the higher cost of diesel, more expensive oil changes, etc. Not saying don't get a diesel, just consider these things in your decision making.