cstrep

We're free to use any tools we think are the best for our work. To test our web apps, f.ex. my.opera, we usually use anything from IE6+, Chrome, Firefox, Opera ofc, Opera Mini, etc...

There's only one rule we're not supposed to break. I'm not sure I can mention it :)

We are (or claim to be :) all hardcore engineers. We don't boast too much. We actually complain A LOT about our own browser, believe it or not. To me that's a good thing. Because it means we care about our browser.

Anyway, to answer your question, I think the best feature is Opera Link, especially Link notes. Shame we don't even mention that here.

I use the notes to save bits of info I don't remember in my head. Then when I go home, or I'm traveling, I can look up and search any note with Opera on my mobile.

There's many other features as well (mouse gestures, M2, ...) but if I had to choose just one, I'd go for Link.