Great product. Loads of functionality. However, I'm struggling getting my head around the UI. In landscape mode, you see three sections: document, current calculation editor, and results. Lots of repeated information. For instance, a comment in a document appears in all three panes. Seems like a huge waste of space. Also, if a calculation has more than one equation, solving it displays one row for each (not unexpected), but you have to scan a bit to figure out which result matches which equation. Would be very helpful to at least number lines/cells.