I agree with both, I can spend a lot of time downloading cards from the 1ds2 and the imagebank wins there for immediate viewing, but the weight and cable can be a nuisance if you shoot a lot hand held ( I don' t, so its not too much of a problem - I also use a really long cable so I don't have to drag the imagebank around a studio with me if I don't feel like it ) but then you don' t have to stop to change cards either.
Anecdotally , photographers who have tested other backs have told me they felt keeping the battery and heat generating gear ( like CF card writing stuff ) probably helped image quality as the back ran cooler - I haven't done this comparison myself but it does seem logical.
I can shoot as fast as my venerable ELX can go to the imagebank so for that reason its a big plus for me.
I note Hasselblad seemed on the verge of dropping the image tank idea with the onset of bigger CF cards and their new generation CF backs but have retained the ability to use either due to ( apparent )customer demand.
The Imagebank is fine. I find it better than CF cards as it is so fast. Images pop right up on the screen when you plug it into the computer. The battery gives it 8 hours of run time. It's light, I clip it onto my belt and forget about it. The only downside is that the cables are expensive to replace.
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