One of the Opal's navigation quirks we aren't thrilled about is the Menu button (the button marked "M," found above the direction control). In most cases, pressing it twice would take you back to the Opal's main menu. Under some circumstances, however, pressing the Menu button twice would only take you back to a submenu, requiring you to use the arrow buttons to back out to the main menu. We would have liked a press-and-hold method for ensuring the main menu can always be accessed in a pinch.