Actually the UI is not half bad if you turn off most of the toolbars, put the remaining toolbars on the sides and go fullscreen. Some of us actually do use OOo on the tablet "for a long period of time;" perhaps we are already insane (by your definition), so that is why we are not driven there. Evolution e-mail's UI, on the other hand, isn't very usable on the tablet. They don't let you change the layout enough.