HE
I seem to remember reading an air test report in Flight on the G120 which seemed pretty positive. Then again, as someone mentioned to me recently, "if it looks right, it will fly right" - there is something awkward looking with all those extra bits around the tail. Only time will tell.
As for:
For an EFT AC.... are you serious? WTF. You don't need performance at EFT. This will just lead to us crashing a fair few.
A few years ago I did EFT on the JP3 - seemed to work pretty well back then and I don't remember there being that many crashes.