RE: picking a TX has become mind boggling !!
I've looked into the XPS system and it's not as advanced from what I can see as the Spektrum or Futaba FASST, they only use one connection instead of 2 so if you lose the one it searches and locks onto a free frequency but during that time you may lose control. The idea behind the dsm2 is that it uses 2 frequencies so that there is redundency.
This is just what I have been told. Besides, the cost of a new DX7 is only $50 more than the module for a 9C.