I sized my demortos 1/2 size up from my mythos. I wear 10.5-11 street shoe, 41.5 Mythos, 42 demortos. They stretched a little, but not much. Basically you can size them to fit I think. Maybe the black color will suck on long summer routes, but I dont think it will be a major problem. In my experience, the hottest part of the shoe is pretty much always the rubber anyway.
I suppose Mythos got some bonus cool points for being purple, but now they dont even have that going for them.