The Best. Been a big fan of Opera browser for a long time now. There was a minor speed bump of bugs when 10.x first came out but starting at 10.10 it has been top notch. Once you learn all of Opera's nuances using any other browser feels outdated and not as well thought out for a user. Speed is right there with Chrome, built in mail/rss and now with the 11.x extensions there is no more excuses to try it.