As far as durability is concerned, the 'test' they are going to be putting it through should be interesting. If it survives that, durability shouldn't be a concern with the Ecoboost.
From the MT article:
"The third concern is one of durability. Ford has done extensive testing with this engine, and recently announced it's going to promote the EcoBoost's strength with webisodes showing the same engine undergoing the equivalent of 150,000 miles of testing, then getting installed in an F-150 on the production line and being driven up to Oregon, where it will do work at a logging company. After that, the same engine will be put in a race truck and run in the Baja 1000."
Read more: http://www.motortrend.com/roadtests/...#ixzz10qS3Z5ez