I am using a 420 EX with my Rebel Digital. It is ok but nothing to brag\nabout (it is better than the internal pop-up, though). The flash tends\nto be too bright, which I end up fixing wiht software (and part of the\nproblem is the absence of flash exposure adjustment in the Rebel D -\nwhich I miss from my old D30).\n\nIs the 550EX worth ponying up the aditional cash? To me it would be\nworth it if the reach were significantly better than the 420 and I could\nadjust output down to compensate for the Rebel D's missing expo adj. I\ncould then ebay my 420 and make someoone with a G3 or so happy. Any\nopinions?