For me the perfect Rolex allround tool watch for all circumstances.
It has a fantastic new movement (I own the new DD40 and therefore know what I'm talking about), an excellent WR, a perfectly sized bracelet and - due to the possibilities of modern technology - a cyclop.
Perhaps it breaks the history of the "original" SD, perhaps it has got the wrong name. I don't care and can't wait to try it on my wrist.
Enjoy it, and wear it in best health! 
Thomas