The idea with these keyboards is that very small movements and amounts of force is needed. The angle of that up key does look a little awkward though. On the Datahand those keys are more or less parallel with the finger itself so they only require a tiny flick.

When I first started typing on the Datahand the most difficult part was getting used to the small movements, I kept hitting the keys by accident. But once you get used to it it's not a problem at all.