Yaw, as a guy who has done a lot of UI consulting I can tell you this-- the more crude your mockup is, the more the viewer focuses on layout rather than design

Yaw, as a guy who has done a lot of UI consulting I can tell you this-- the more crude your mockup is, the more the viewer focuses on layout rather than design. Crudity like this will keep people from saying, "what if we had rounded corners there?"