I needed to upgrade my flight controllers from F1 processors(Naze32, etc) since Betaflight is dropping support for them soon. I ordered two of these Kiss FC clones and received then in four days (with standard shipping)!
The boards connected to BetaFlight with no problem. The controllers are pre-flashed with BetaFlight but it is an older version. I tried upgrading the boards for several days using various utilities (DfuSe Demo from STM, dfu-util, BetaFlight, etc) and different drivers with no success. Some tools would report success but when connected to BetaFlight the old version was still there. I finally downloaded the actual Kiss FC software from the Chrome store. The actual Kiss FC software would not connect to the board (as expected) but it apparently installed the correct drivers. When I connected the board to BetaFlight in bootloader mode, the connection showed as DFU. I then went to the flash utility in BetaFlight, downloaded the latest version of the software for the Kiss FC and it flashed successfully. BetaFlight now reports the latest version installed.
My quads seem much more “locked in” with these controllers. PID tuning was very easy also. They are quite an improvement over my old boards.