Cubase iC Pro! Only way to get a proper cue mixer (vertical side-by-side sliders) on-screen.
They work well. You can use several devices at once, with different info on each, even up to four cue mixes.
Devices smaller than an iPad mini will give you the single function display, otherwise you get the multi-part display. See the pics on the above page. Note that this means 7" Android devices will give the single function display.