I manage my own bookmarks via a personal website. I've had too many problems in the past decades with bookmarks managed by various plugins and browsers.
I've been using this new version of Opera for a while now. This reply is via Opera 15 in fact. I love this version of Opera. My biggest worry is probably unique. I worry they will add "features" to it and make in unusable. The best feature they could include would be allowing different versions of the browser to be run at the same time. So if we install Opera 15.1 next month and don't like it we could continue to use Opera 15.0. Cause this version of Opera, 15.0, is fantastic.