While I don't use opera as my primary browser, I have kept a copy for web development purposes. What has always pleased me about this browser is that it is proof a commercial company can abide by the W3C standards, unlike Microsoft and their Internet Explorer.

If there was no Firefox I would be using Opera as my browser of preferred choice.

It is claimed by the company that its new browser is more than twice as fast as version 9.2 when rendering
JavaScript and HTML.

Although it accounts for a miniscule share of the desktop browser
market, Opera is the leading browser on mobile phones, including
handsets such as HTC's Touch Diamond and most of Nokia's line.

Opera's share remains small, but has grown
by approximately 43% in the last 12 months, according to Net
Applications' numbers.

Opera 9.5, available in 30 different languages, can be downloaded free of charge from the company's site for Windows 95 or later, Mac OS 10.3 or later, or Linux.