I am finding Opera an interesting browser. Used to use it years ago in Windows but eventually moved to others. I download and installed the 25beta release.
The biggest issue I have is what others have already mentioned, namely the inability to import bookmarks.
It seems someone just blew it with this. Every other browser I use has the capability, but not Opera 25. I've tried all the solutions mentioned and no help. For now I'll keep using it on a casual basis and see if it will come along.