A solid piece of entertainment. Comfortable. A novelty and bragging right, in the main. You don't need them at all. Keeping current statistics about oneself necessitates them. But it's all the devil's doing. The eyes of Big Brother are upon you. Let's wait until Apple chips can be surgically inserted anywhere on the body (in the, on the forehead, in the arm) before we start worrying about being monitored (what we eat, how many children we have, how much money we have in the bank).
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