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Good question. I went from using a mixture of 430EX, 550EX, 580EX because of the output in MANUAL slave mode. It seems quite obvious to me that if group A is set to 1/2, and one flash is 580EX and the other is 430EX you are going to get a different amount of light from each flash.
Since Canon master is seeing the preflash from BOTH members of that group, all it can do is select ONE power level to fire at that best lights the subject. If the master output is one level (whether that is 1/16, 1/8 -0.33, or 0.836893) you are going to get differ amounts of light from different units.
I must admit, I never noticed a difference in output from the 3 different flashes. But I knew it was there. I feel more comfortable with all 580EX II units. A bit anal, I suppose. Who cares, Canon EX II units are dirt cheap. Oh, so am I!
EDIT:
ETTL? With multiple flash units? You really need to be in manual mode at this point.
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