I have tested so many browser included Opera 11.10, I was download for Mac OS X version. I was used Opera and still used for my alternate browser. For me Opera Browser is fast booting, easy to use and Free.
Began on Opera version 11.10, opera team has new tagline: Smarter Browsing. They offering three main features
Make your web browsing faster. Loading pages and running web applications is really snappy. You can even speed up browsing on slow connections, with Opera Turbo.
Safe and secure
Reduce your exposure to threats. Your safety is ensured by industry leading security, Fraud and Malware Protection and a clear display of your security level.
Use great features that make browsing faster and easier. Opera has more features built-in than other browsers. You can also add even more with extensions.
Watch a smarter browser for an easier web video
You can download Opera 11.10 for Mac OS X on this page