The last jet I set up, I somehow overloaded the EXBUS comm. I was using a REX12, Cortex Pro, REX 3 900, turbine sensor and LGC15. The Cortex Pro would not reliably initialize. I think I had it daisy chain connected with one of the other devices. Anyways, we figured there was enough latency to make the CP not get started. I redid the wiring and all is well.
So, I think the EXBUS can use some improvement. I also would like to see the 2.4 and 900 transmitting simultaneously (like Frsky).