It seems like Canon knew about the problem during manufacturing and the units with the A or black markings in the battery compartment could be units with some bandaid fix in place. Looks like a design issue.
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Form-fitting 580 modifiers (e.g. StoFen) do not fit on the 600 head. However, modifiers for the older 550EX will fit, albeit snugly.
I'm sure there are some people for whom one single feature is so critical that it's the only one that matters, but for most, it's important to consider the whole camera...
What really matters is what sort of photography you can do with it and so far we haven't been treated to any earth shattering breakthroughs in image making as a result of these two stops of additional DR. If it was as significant as some would have us believe, then we would easily be able to walk into any gallery and pick out the Nikon images from the Canon ones – but we cannot. We continue to be treated to the same me tired, contrived examples that are completely devoid of any artistic value whatsoever and I doubt that THIS will change even if Canon were to come out with a 15 stop camera.