Primary considerations that need to be addressed before using the above techniques are how high are the ceilings and are they white. If the ceiling is very tall, chances are the flash wont have enough power as the light has to travel from the camera to the ceiling and back down to the subject. Opening up the aperture may help, but not if the distance of the ceiling exceeds the power of the flash. Secondly, if the ceilings are not white, whatever color they are, those hues will be imparted to the subject and create an odd color cast. White ceilings are the way to go as the reflected color will be neutral. One final thought - bounce flash not only creates a nice soft light source, it also prevents red eye.
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