Slowly moving to Opera, and just moved DC and Facebook over here... WOW! What a difference! It's like night and day.
I used Opera for a long time, then things started breaking, and moved away from it. So far everything has been bang on with no glitches. And much faster.
I've been finding that IE and Firefox are simply way too slow now. I use IE for a few sites and nothing else, and it's painful. Firefox is getting just as bad, but not quite. Then again, FF takes up a gig of RAM while IE takes up very little. Trade offs...
Said it before, so I'll say it again... All browser innovation begins in Opera. Now, if only the other browsers would try to copy that little innovation in Opera that we fondly refer to as "not being mind-numbingly sluggish to the point of making me want to stab myself in they eyes to make the pain go away..."