Has  someone  already experience with the Cynova ND Filters?

For the mini and the mini 2

I have used Skyreat and Freewell filters and they work quite well.  Sorry, but I haven't heard of or used Cynova filters.

Hello there. Thank you for reaching out and for the inquiry. Since this is a 3rd party accessory for the DJI Mavic Mini and for the DJI Mini 2. I hope that you will get the best recommendation from our fellow DJI co pilot on where to purchase the said ND Filter and share there experiences using it as well. Thank you and fly safe always.