It can not be simpler to manage its flashes. No need to enter the 5th in the camera menu and to return to each setting. Everything is at hand and eyes; available: - Group: A, B, C with its setting from -3 to +3 - Mode: eTTL, Manuel, SS, Off - Sync: Rideau, H + - Zoom: for each group. Not even need to read the documentation All brand flashes top eTTL work, even an old 420EX and 270EX small. Update via USB - test button, sync cable outlet .... for the price ... What else?