It's beautiful and rich on features and support for all the fancy new CSS, Javascript and DHTML toys. If only it was a bit more Mac like I'd change my default browser from Safari. Until then it's great to have around for those rare times when Safari doesn't work.
If you don't use a Mac, why are you still reading here? Go download it already!
Mac users will be happy when v1.1 comes out. On the list of improvements for 1.1 is "Ongoing HIG compliance work for Aqua".