I am using a serial port PFC Cirrus II BATD with PFCcom64 and FSUIPC7 in MSFS without difficulty. I was waiting on RealityXP to release MSFS versions of their GNS430/530 which I now believe will never happen. The PFC430 is a USB standalone unit which works well with xPlane v9 (FAA certified version) and FSX, I am able to get FSUIPC to recognize buttons on the PFC430 and could program them to another function if needed but since they are working with the RXP software there is no need. In MSFS2020