Well, the high cost might be worth it if the quality is there. I'm very unhappy with the quality of the X9303, but IF the 12X is assembled with tighter-spec'd discrete components (diodes, resistors, caps etc.) and higher level QC standards with tighter controls, and maybe extend the temperature range for operation, then it might be worthwhile. The difference in price between the 12X and the X9303 is only one plane. If course, if there's no difference in quality then the price is too high for me.
