I'm using it now, under Windows. It's purty too. Been using Opera for years, and mostly happy with it. Main small problem I have; I think some web pages are written with Firefox compatibility in mind, and don't play quite so nice with Opera. Mostly I much prefer the Opera UI, though. Really don't like the way Firefox handles tabs.
I haven't been able to connect to the Debian repositories for a couple of days, so I guess the servers are getting thrashed a bit. Will be nice to have version 10 in Linux, where I spend most of my time now.