The big interaction problem that I always have with circle menu's like this is that when you use it for the first time, without knowing how it works, it's like

The big interaction problem that I always have with circle menu's like this is that when you use it for the first time, without knowing how it works, it's like mystery meat. You click, drag, release mouse, something happens, too fast to see it, since it auto-selected the link in the edge you dragged to, and opened it in a new window. Now i've completely lost my context and have to do the same thing again after I close the tab, Now i'm on a desktop, but on a tablet this would be even more annoying. I have this same UI on Snap Camera on my phone (try it, it's still awesome), and i've seldom had such a love-hate relationship with a UI. The rate at which you select something by accident, and unexpected behavior happens is just too high.