Any suggestions or ideas why the speed dial pages won't sync automatically? Because this is how it was designed to work.
IOW, Speed Dials do not sync as such (changing your Speed Dial in Opera on one device won't cause the change to show up in the Speed Dial on another); but they do show up as "Other Speed Dials" in the Bookmarks sidebar.
So only bookmarks will be synced between devices and an "on-line backup" will be created for Speed dials? I fail to see the logic in the design... Well this is rather unfortunate, thank you for the information