The ads themselves are a bit large especially on smaller screen resolutions. If you grow to like Opera, you may want to fork over the fee. I recommend that any Linux user who is disenfranchised with Netscape give Opera a serious look. It is likely to bring you a new sense of satisfaction not seen with Linux browsers in quite some time. Opera's statically linked binaries and systems with Qt 2.3 provide anti-aliased text.
Opera has a full-screen mode.
Opera provides a multiple-documents interface, containing all the pages you're viewing in a single window.