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We are often lulled into the assumption that a gearbox can handle whatever job we are applying it to for the desired speed, but with ratios this high, they can certainly self-destruct if too much motor is used. It is important not to use a motor that can yield more torque at the output than the gearbox can handle. Planetaries by their nature have very small teeth for their ratios, which is why they are so compact, but this limits their output torque compared to more robust designs. For high-ratio, low torque applications were compact size is a primary consideration, they are great. But if you are planning to push a planetary hard with a torquey motor, beware.