Phoronix has posted a review on Opera v8.50 for Linux

This past summer Opera Software ASA's CEO, Jon S. von Tetzchner, promised to swim from Norway to the United States if they reached one million downloads in four days. As expected, this marketing ordeal generated a wealth of publicity for its Opera 8 Browser and today they have made another strategic move by eliminating all advertising banners and licensing fees relating to its latest Opera web-browser. Of course, with this browser now being 100% free and offering an entirely enhanced GUI as well as improvements to its security, speed, and customization (among other features) we couldn't help but to try out this multi-platform browser for ourselves. Today we have our visual results from our experience with the latest Opera for Linux 8.50 release.

Opera Browser v8.50 for Linux