I've used Opera ever since version 4, back when its main selling point was that it fit on a floppy disk. I had been using Netscape, but development stalled, and there's no way I would use software from a convicted monopolist if a good alternative exits.
I've upgraded Opera over the years, even as it got fatter with add-ons I never use, like email. There's just so many nice little features that save so much time, like righ-clicking a word and selecting "Go to URL."
I installed Opera 9 this morning, and it has a major flaw: following installation, all text is missing from pulldown and shortcut menus. I checked the Opera forums and there seems to be conflicting ideas why its happening.
However, I did come across one tip that worked for me: use the Classic Installer instead. How? Go back to Opera 9's download page, and there is a link (near the top) for the downloading the Classic Installer. I did that, and my Opera has its text back.
(Even now, there are text problems. It appears that proportional spacing between characters on buttons is flawed.)