Why not a push scooter? Or a regular skateboard? They weigh about 4-6 pounds. Not too much trouble to lug into a classroom. 15 pounds seems excessive. 12 is better, but get it under 10 pounds and now we're talking.
After looking harder at it, the product seems nice, good form factor and reportedly not much extra effort to push yourself, but the audience for this is going to be limited.
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