I bought $5 platinum Chinese knock-off props from ebay and I don't like their quality. Mavic shakes when motors are engaged, flying was fine, seemed a bit faster actually, I still have to run some tests. But what's scary is that some plastic near the metal rods that hold the props, on the underside, was melted, so not sure how long that rod will stay in place before popping out and dislocating a propeller, sending my Mavic on its deathfall. When I bought them on ebay, I thought DJI official platinum props were $35, from the old videos I saw, but now I see they're down to $20 for a set of 4, and I can live with that. I'll be ordering a set from DJI.