... Because the product did not deserve. Track after the first 22 hours charging so slow that you can not keep his balance. Without own body weight, the wheels turn correspondingly faster and come probably at higher speeds, but running alongside her is so silly. According to the description allowed the payload max. Have 100 kg. I have just under 90. So it should work, but a standstill faster. Too bad, but it seems well to give reasons why competing products are significantly more expensive.
Replacement is not only provided in return. The will already know why.