The 9CHP will accept the 8ch futaba fasst module, and the Spektrum 8ch module also, I have the Spektrum in mine. I am very pleased with my 9CHP
after moving from the 7CAP. No issues that I am aware of, a few other pilots at my field use the 9c and have had excellent luck witn them. Make sure
you get an instruction manual or download from Futaba (much more programming than your 6EX (thankfully it's user friendly).