I have been using the X8R for the last 6 year and these are the first for my new planes.
I have installed in a PilotRc Edge 540 107" with and RB30, and I am really impresed.
They have the same dimensions, but there are better funcions.
Like too much the speed of Sbus, PWM and general working process.
Definitely it will be my new standard. Great work Frsky.