One feature I found extremely useful, something I used hourly, was the drop-down arrow in the upper left that would show the history of all recently closed tabs. How do I re-enable that? I see that you can access the recently closed from the opera menu, but it was quite convenient to have that pull down right there all the time.
Also, where's the zoom slider? Same deal, it's in the opera menu, but it was much more convenient directly accessible.
And what happened to having separate "open tab" and 'open tab in background" options when you right-clicked on a link? I used that distinction all the time.
One of the main reasons I give to other people why Opera is better than the rest and they should try it is the extreme amount of customization of the tabbing that's available.
All the other browsers, firefox, IE, chrome, etc, either do some thing "wrong" by my preferences, or just give you barebones. Opera let you setup tabbing the way you liked it.
The other key reason is that browsers like IE, firefox, and chrome were enormous memory hogs. I installed 4 gigs of ram, and chrome uses up 3gig for itself, leaving nothing left for photoshop. IE has no support for XP anymore. And firefox is just all wrong in terms of usability. And IE would bring a 1gig ram system to a screetching halt with two tabs open.