Bryan,

I have had the EXP Bus in my RV-6 13B for 600 hours.  It has been flawless until this year.  I had intermittant problems with my EIS, and then my nav lights would only stay on for a few seconds each time I cycled the switch.  I tracked both problems to the electronic CBs in the EXP.  I don't know if the polyswitches "wear out", but I replaced two of them that were offending, and all is well now.

I have a separate backup circuit for flight-critical items, and it has a direct feed from the battery.  If something blows in the EXP, I flip two switches to keep the rotating thing going, and I can turn the master off if I need to (e.g. electrical fire)

Not sure I would use the EXP again.  I have thought about changing to traditional wiring, but it would be a HUGE project at this point.

Bill Eslick