Design: they look good, they don't have the extra hole to do the runner knot :(.
Fit: to put in perspective, I wear 11.5 city shoes, 12 running shoes (Nike, Asics, some Pumas), and 12.5 Adidas which always need half a size up. I got those in 12. They feel just a tiny bit too big, but not enough so I would order an 11.5 so keep that in mind. The toe box is Ninja Turtles big... I have a 12(M) yet this is the widest toe box I have ever seen but it is common for Nikes.
Performance: this is half an issue. I ran a half marathon with them without any issue, no blister, good light responsive feel. My only complaint is that when sprinting or going fast in turns, the knit stretches to a point where it feels you're running on ice a little bit and lose some traction. I appreciate the knit snug effect but it might be a bit too stretchy for me. I will keep them for long distance races and will avoid high speed short distance races.