I've been opera user since 3.x or something. They had some funnies now and then but never so distracting i'd switch to another browser.
Tried ff recently and god was it a bad expirience. I'm used to more snappy interface response.
Oh and there's opera 8 beta available. It's simply amazing ... when you think there's no more that can be done to improve UI, they suprise you with a bunch of really neat features. They're light years ahead of competition with their tabbed browsing (since they invented it, no wonder).