I've been using it most of this week, very mixed results, it doesn't open quite a few of my favourite sites, I can find no way of turning off google and other advertisements, I don't like the way it handles favourites and the spell checker doesn't appear to work.
It throws up java script errors when I close it, and sometimes opens things in new pages instead of tabs despite setting it to do tabs and does not size windows to fit the screen correctly, I'm of the opinion that it needs a lot of work doing to it before the release version.