After you try the Kinesis Advantage, the Microsoft Natural feels like a joke. The length of your fingers is distributed like a parabola and the Kinesis design

After you try the Kinesis Advantage, the Microsoft Natural feels like a joke. The length of your fingers is distributed like a parabola and the Kinesis design is the parabola that fits over your fingers to minimize the travel distance of _all_ your fingers. Conversely, the Microsoft Natural keyboard is actually a parabola that goes _away_ from your finger to actually _increase_ the travel distance needed for your ring, pinky, and index fingers.