It’s story, the case, the doomed sapphire, the on-board technology, the endlinks that increase the feeling of thickness, the bracelet which is less wide than the one on the 12, the weight….
I had a 116660 (black dial) for about 11 years. VERY cool watch, but I hardly ever wore it because I'd tend to favor a smaller vintage SD or a 1680. Then I swapped it for a 126660 JC, which I wear more often because the blue dial doesn't compete with anything else. I like all variations of the DSSD, though. I want to see it side-by-side with an Omega Ultra Deep.