I test drove the 2010 flex with the ecoboost engine 355hp, 3.5 liter Turbo, and it moves fast. A little pricey as new, hoping to wait 2-3 years to buy a used one. Probably called flex due to it being flexible in usage as it can serve as a minivan, people hauler, tow upto 4500 and has an AWD just like SUVs. Being almost 5000 lbs it goes from 0-60 in 7 seconds and is much more fuel efficient and powerful than most small V8's out there in trucks or SUVs.