Now strength and toughness is where Titanium excels. Durability is not a scientific term used, we can think of it as the life of a material under cyclic loads, like a turning shaft i.e. fatigue life. Titanium is also great in this aspect, but it is quite irrelevant in a watch case, as a case never fails under fatigue. However it can be important if it is used inside the movement or for a crown or pushers. Strength denotes how much load a material can bear before failing. Titanium has very high strength around 1000 MPa for Grade 5. Five times that of ordinary steels. Even pure titanium is quite strong with Grade 2 being around 350 MPa. However there are alloys of steel that have even more strength than titanium, such as the tool-grade steel that we mentioned above, or some special Aerospace steels (e.g. 300M) have around 2000 MPa strength. Toughness denotes how big an impact a material can absorb before breaking apart. Titanium is really great here, absorbs lots of energy around 20 joules on impact test. However once again there are steel alloys that are better up to 150-200J for Austenitic stainless steels (there are also steels with very poor toughness such as Martensitic steels). Toughness beyond a point is however not important for watch related applications. It is not likely that you will smash you watch to such a degree that its case will break. Well before that would happen the delicate movement would fail.
People love the high-contrast look of E Ink watches. I have reviewed a few Phosphor watches and in each case I have found that people who check out the pieces are really drawn by the screen - yet no one knows what it is. I was totally under the impression that widespread marketing of the Amazon Kindle more or less informed people of what E Ink is. Yet the mainstream consumer seems to consistently ignore these little details. Glad I have my geeks around me.
Case: Stainless steel with black and rose-tone gold hard coating
Rather than go ultra complicated with something like a Rado tourbillon, they instead wanted to bank in on the pop-culture inspired futuristic look that has been popular as of late. The R-One does have that hallmark - enough though it is a decidedly strange watch. No designer would ever make something like this as a mainstream piece - it is art.