I've been using it since it came out for Windows a week or two ago, and it's wonderfully fast (as well as beautiful). Using Opera used to feel like sacrificing performance for functionality, but now I feel like I have the best of both worlds. It is still beta, and there are a couple bugs, but for the most part it's a great experience.

> sacrificing performance for functionality

That's what I feel about Firefox compared to Chrome or Opera.

Which Firefox extensions would you miss if you used Opera? Opera has built in support for tab thumbnails, mouse gestures, Greasemonkey scripts, widgets, etc.

Tree-style tabs:

https://addons.mozilla.org/en-US/firefox/addon/5890

Still not matched anywhere else. The bogging-down from ridiculous numbers of Firefox tabs may soon force me to switch, however.

I also like some of the highlight plugins for translation and search.

Ah, the tabs tree does look useful.

Opera 10.50 has new search highlighting, though, and the right-click context menu for highlighted text has included a translate option for a while now.

Tree style tabs would be better if the tab panel would expand and put thumbnails under the links. I don't like that they automatically collapse either.

Adblock Plus. No other browser comes even close to its ease of use.

I hope they can get some buzz for Opera 10.50. I really love Opera. Try the email client and you know what simplicity means.

I tried it. It was pretty fast and rendered everything well, however, without lastpass or 1password support it's tough to fully switch over.

Yep 1password is what is keeping me from using it... I used to use opera a long time ago, but was wowed away by 1password and inquisitor on safari...

I tried it for OS X, but scrolling sucks and I can't seem to adjust it. There's also some other little things I keep finding that annoy me... It may be faster than Safari, but not compellingly so.

I installed it, it lost my saved tabs, and the sidebar looks out of place. I recovered my old version via Time Machine, so until they bring out a stable version, I will wait for thee.