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Grasping to straws if there is any reason for me to get a 5d3 instead of a 5d2 I'd like to get you opinions about the importance of the dual-card slot. Only the 5d3 has it, Nikon puts it even in consumer models like the d7000 which was very appreciated in reviews. The question is: What's it good for?

• Speed: on the 5d3, that can't be the reason because the sd slot is crippled and much slower than udma7 cf. Does it make a difference if writing hires jpeg to sd and raw to cf in comparison to writing both to cf like on the 5d2?

• Reliability: brides are said to be somewhat grumpy when your no-name budget cf card breaks without jpeg backup on a second card, if you are a high profile shooter this could even ruin your business. The question is: how large is the likehood of cf/sd cards breaking without being recoverable, and are there differences between brands?