My experience in G6000 Vision tells me that it is compelling and hard to ignore, but the R-C system was, in understanding, pretty fail safe. Non-current data base, no SVS, not enough satellites, no SVS, not selected for display each flight, no SVS; prominent SVS FAIL EICAS message. That said, first trip with it, rain and low cloud going into Rio de Janiero. Very happy with the view, nearly VMC in IMC. Then, the system lost some satellites (6 is min, IIRC) and back to nothing. For a brief moment, it was like needle, ball and airspeed.
We had a similar argument with the regulator when displaying "own ship" in the charts as part of RC Proline 21. Chart with "own ship" is on MFD 2, between the pilots and FAA says, you can't use "own ship" as navigation. Reply was, "we're not, just another SA tool."