What's with the lines "breaking" up when you zoom in ? I've dealines at the moment so I won't get to put Manga Studio to good use yet.
How do you mean? Black lines will look jaggy compared to Photoshop because they're deliberately aliased -- the idea is that to enable you to create digital art files that would be the equivalent of scanned traditional inks, which should be aliased (ie - hard edges, rather softer, slightly blurred edges) to enable a colourist or a flatter to make quick, clean selections.
Think of it very specifically for layout, pencilling and inking -- I'd still advise colouring in Photoshop and lettering in Illustrator.
(I think we've got a Manga Studio Q&A thread somewhere -- I'll see if I can find it and bump it back up to the first page of the Active Topics list…)