1. It has everything, no plugins/extensions needed (except Flash and Java)

2. Opera Link is integrated with Opera, it syncs bookmarks, notes, quick search and more between all your computers.

3. Keyboard and mouse shortcuts/hotkeys

4. It’s customizable, unlike chrome and safari you can change the browsers look and remove search fields etc.

5. When it’s customizable it can get a really minimalistic look:
(no search box, no forward/backward buttons etc)

What i miss with using Opera

1. Password synchronization

2. Feedly is a great organizes and read your Google Reader.