I uninstalled it immediately after discovering that it doesn't support the mouse wheel correctly - it should have scrolled down a page when I moved the wheel down one notch, but nothing happened. Instead, it jumped to the bottom of the document and back when I moved the wheel one notch up. Now, that's quality.
Even so, it still beats the pants off Netscape 6 - although I didn't think to check the Alt+Space keyboard shortcut to see if that worked in Opera. (That is one of my biggest complaints about Netscape 6 - it doesn't support even very basic things like Alt+Space.)