Full-size truck-based SUVs were wildly popular in the '90s, but crossover SUVs are (for the moment) the hot segment in the car business. The 2007 model year saw the introduction of more than 10 new or redesigned crossovers, and more are on the way. That means plenty of competition for the CX-9, but if it proves to be trouble-free and crashworthy, Mazda will have a winner on its hands.