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. .
Electric stabilizer for smartphone DJI Osmo Mobile 4
31 Review
GoPro Hero 7 Black Bundle - Extra Battery + Super Suit Dive Housing Case + 64GB SD Card - E-Commerce Packaging - Waterproof Digital Action Camera with Touch Screen, 4K HD Video, 12MP Photos, Live Streaming, and Stabilization
58 Review
Panasonic SDR S26 SD Camcorder Blue
38 Review
Quadcopter DJI Mavic Mini, white
37 Review