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I prefer our system, personally. Metric's nice from a mathematical standpoint (hence why it uses the various prefixes), but using inches and feet gives much better reference points and allows for more immediate understanding of what a certain height entails. It's more human, essentially.
The better part is that, if you know what a foot is or a yard is, even without explanation you can say, "Oh, so a foot is about this long" or "Oh, so a yard is probably larger than a foot". It's designed to teach in much the same way as World 1-1. Sticks easier for that reason, too.