Just completed a rtw trip:

CHS
PHL
AMS
MUC
HEL
NRT
SYD
AKL
SYD
LAX

All went without a hitch except for the SYD-LAX bit which only earned 50% mileage in L which I'm kinda pissed about. The whole process is ridiculously convoluted, but for the most part it worked out pretty well. Happy to answer any questions...