I can easily live without this feature. It would be nice, but I can just copy/paste the speed dial every now and then.
Unfortunately copy/pasting speed dial is something a little too complex to communicate to clients. People want now days a flow of using their devices, from home, to office, to phone while commuting and then back at home (PC/mac/tablet). Lack of one-speeddial between devices is, from average users point of view, something that is not a sales point for Opera in "tech enthusiast" crowd, for whats-a-browser crowd it most likely is. But which crowd is more likely to use Opera?