Sweet. I think that is my next watch. I think Rolex missed the boat a little with the SD4000. I think it would be better at 42mm with the 15+mm height. It would also make it a good intermediate step between the Sub and DSSD. Still an great watch at 40mm though.
If gen, go for it, you can always flip it for close to what you bought it for if you buy smartly.
If rep, maybe wait for the "super rep" 116600 that is supposedly coming soon. In the meantime, just remove the cyclops on a rep 116610 and you are good to go.