design. The rather extreme lengths Rolex has to go to to give the Deepsea its 12,800' rating, with its 5mm-thick domed crystal, the super-heavy case, the titanium back, etc., all make the watch needlessly thick and oversized for most wearers, especially actual divers unfortunately. When I bought my Sea Dweller from a professional deep sea diver, he said that several of his cohorts in the industry had tried the Deepsea and had to sell them again because they were just too unwieldy to fool with on the job. Hello? When actual divers won't use a dive watch because of its incompatibility for their job, you know something went off the rails in the design stage.
Also, I don't know why Rolex insists on using an undersize dial on the Deepsea with a thick steel ring around it, but it looks like a bad compromise to me. If they say it's needed for support of the crystal at great depths or something, fine. Then make it black with a minutes track on it and move out the hour markers on the dial to suit. It would look amazing and they would simultaneously eliminate parallax on the minutes hand.
No, I like the new Sea Dweller far better and it's far more useful. I'm already thinking of moving my Submariner along to buy one. If the SD 4000 is ever equipped with the blue-and-black dial, I'm on it like white on rice! >;^D