I’ve been running the beta for a bit, and it knocks the current Safari version’s socks off in terms of raw speed, and has a fullscreen mode. I can’t get used to some of its quirks, though - I hate its “magic” do-not-ask-for-permission updates, and besides the UI, it has a few issues with rendering Unicode glyphs for some odd reason. It’s nice to have someone competing with Apple, though, because that means the next version of Safari is sure to stack up.