All I can say from personal experience is:
1. Low noise (longer fly time) knock-offs have negative effects on Mavic stability....which really shows up when hovering.
2. They reduce the high frequency 'whistle' sound.
3. Knock-offs are made of a different resin type and are not as robust as the DJI low noise props.
4. In retrospect, it seems like a bad place to save a few bucks.
1. Low noise (longer fly time) knock-offs have negative effects on Mavic stability....which really shows up when hovering.
2. They reduce the high frequency 'whistle' sound.
3. Knock-offs are made of a different resin type and are not as robust as the DJI low noise props.
4. In retrospect, it seems like a bad place to save a few bucks.