They do exactly what they're supposed to do; protect propellers. Luckily, they're easy to put on and take off, no tools required. I've seen some reviews of them with weight warnings, but personally I haven't seen that. I've also heard that they can reduce flight speed and distance, but as I only use them indoors this obviously wasn't a problem for me. They are essential for indoor flying as the Mini has no front or rear sensors. .
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