I'm really enjoying all the older features, master password, fit to width, torrent client, refined text wrapping and now my extensions work again.
Unfortunately it's not without its bugs, I have a feeling Opera moved to chromium to relieve all the issues with google's constant adjustment to their HTTP code. The fit-to-width feature really can't handle google search results or gmail but it's a simple fix by disabling the feature. Pressing space bar to move down the forum webpage works fine until you reach the end and it mysteriously jumps into another forum thread! Plus, I always hated the Ctrl+Tab preview rather than instant switch.
Launching the browser is ridiculously faster, about 10 tabs load within 3 seconds where as the chromium based would sit for triple that time.