Epiphany, Galeon, and Konqueror - and Firefox are great; but they're not Opera. For us Opera "affectionidos", (there's alot of us), there's no substitute. Like most things in Linux, it boils down to personal preferences. Opera was the first Non-Windows software I installed and used. I've used it for years and for the past three years use it in Linux. That said, I, too, experienced problems upgrading to Opera 9.2 from Opera 9.1 in Bianca, but this story has a good ending as I'm now using Opera 9.2.
Initially I tried to update via Synapatics, using the Romeo repositories, but wasn't able to because Synapatics kept telling me I couldn't because I already had a version of Opera installed. So, I then went to the Opera download page and got the .deb package for Ubuntu Feisty. It wouldn't install for the same reason. I then went back to Synapatics and "uninstalled Opera 9.1", then again attempted the install of the .deb packckage: and..voila! Don't know why it worked...but, by crackie, it did. Bookmarks, themes, feeds etc. all intact.