I just installed Opera 32, upgrading from v. 12.16. Importing bookmarks was easy; organizing them was terrible (see this thread). But I find the Bookmarks interface not to be that much different from the old Bookmarks panel, once you organize bookmarks into subfolders under My folders. If you had that kind of organization in the old Bookmarks panel, you should be able to import it and recreate it in v. 32. Once it's in place, you can hover the mouse pointer over a folder, right-click, and select Open all in new tabs or Open all in new window. (If there are 10 or more sites, it will ask you whether you really want to open so many.)