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Full user review
"Opera innovates, everyone else imitates"
Opera continues its long history of advanced features and expanding the capability of browsers. At the same time, Opera is reliable and not crash prone like its imitators (e.g. infernal exploder, firefox, chrome).
Opera is (and continues to be) the only browser that adheres to and obeys ALL internet standards mandated by the World Wide Web Consortium (www.w3.org), all of the more popular violates those standards.
Opera can do everything that the other browsers can do or claim to do, but with less bloat and more speed - and without requiring 30 or 40 plugins like firefox requires. Opera also doesn't include chrome's spyware.
The only con is not Opera's fault: websites owners deliberately cripple their sites for anyone not using one or two "big name" browsers. You have to tell Opera to pretend it is a different browser, then you will have the same experience as those using other browsers.
Opera has it all and works better than other more popular browsers. Anyone who uses it objectively will know that. Opera is also backwards compatible with older OSes. And Opera can be used without a mouse, only a keyboard, something none of the "big" browsers can do.
If you encounter a website run by jerks (e.g. google), sites claiming "Opera isn't a modern browser", do this:
(1) Right click on the page then
(2) Choose "Edit Site Preferences", then
(3) Choose "Network", then
(4) Choose "Browser Identification" and select "Mask as Firefox".
Now press F5. You will see the exact same page as show to firefox users.
The only websites where Opera "doesn't work" are websites run by jerks. They design their websites to ONLY work with one or two browsers, and deliberately cripple the site to harass users of browsers other than what the site owner prefers.
Here are two screenshots of google's main page, both viewed with Opera 11.61, and were taken one minute apart on the same computer:
In the first one Opera identified itself as Opera. In the second, Opera identified itself as firefox. Why do they look different when it is the same software on the same computer? There is no justifiable reason for that.
The only reason companies do that is they are afraid of competition, so they harass people who don't use their product. The intent is to harass people enough so they stop using the browser being targeted.