The newer version so far is pretty bad. You can't even right click on a web page, and send the link, through the default mail program. The bookmarks are still backward. You can have a personal bookmarks toolbar for important folders, but no menu item bookmark bar to store large collections of bookmarks (something all of the other competing browsers have. Some of the stuff that Opera 20 doesn't have is so basic, it's beyond the pale, that it's still not there.
But the only choice is to use what you like (Opera 12.16 for example, with its wonderful range of features), and hope the Opera developers listen to how inadequate for most users Opera 20 is so far, and make changes, before the user base totally deserts.