My first impressions of Opera:
– it’s fast, especially the back-button is lightningfast.
– tabbed-browsing: closing the last tab you opened will return you to the previous tab, and not (like Firefox) to the most right tab.
– tabbed-browsing: when a non-active tab has new content, the title changes color.
– no getting-used-to time needed. It just works like it should.
– compatibilty (certificates, etc.) is okay.
– not sure if I like the panel-bar
Update 23-09-2005: Opera does not work correctly with postbank.nl.