I really like the Wall Tracks concept, and I fully intend to purchase more sets from this line for my five year old son. The Mid-Air Madness set was a huge disappointment. If the purpose was to get several cars in a continuous figure 8 untril they crash, that never happened. The problem is the U-turn piece on the far right of the assembled set. After crashing onto the track, a car NEVER has enough energy to make it around that U-turn. Even if it did, it certainly didn't have enough energy to make the subsequent jump. Cars either get bunched up in the U-turn or are constantly falling on the floor because they're too slow to make the jump. Not exactly a recipe for hours of fun.