So I've been using Opera 16 the past few days.
With Opera extensions, and with most Chrome extensions working in Opera 16, I don't feel I'm missing too much with Opera 16. It's certainly lacking in features compared to Opera 12, but it's ok. And bookmarks can at least be imported and used on a basic level.
Find text in page? There's an extension for that. Save session? There's an extension for that. etc. I can't get the speed dial start page to change from the Opera one, though.
Firefox can do more stuff than 16 and Chrome, and I use Firefox for certain particular things, but if you don't need it for those particular things, then that doesn't matter much.
Maxthon 4 has a lot built-in too. Nice little browser. I mainly wish it was a little more pleasing to the eye.