Photographers have a love / hate relationship with flash.  On camera flash looks like crap, but as soon as we get the flash off camera, triggering it and getting good images seems to become an exercise in black magic.  Oh I know, every manufacturer has a "wireless control system" usually based on infrared, which as we know is Latin for "doesn't work in the real world."  Or only works for guys like Joe McNally.  Radio controlled remote TTL is the answer for the rest of us