Ford's crossover, the Flex, shows off original style in a practical people carrier, but doesn't short on the tech side. The 2010 model can be had with Ford's new EcoBoost engine, which delivers a huge amount of power without giving up fuel economy. The navigation option is excellent, featuring traffic, weather, and gas prices. Our review car lacked this option, giving us a chance to try out Sync's navigation service. This service proved problematic and frustrating, reinforcing our contention that onboard navigation is the best.