Set this up last night on my Mac. The eye candy is always nice and it's very Apple. They took the cover flow from the Finder and iTunes and made it work with your History and book marks. The Top Site feature will be my new home page. The tabs on the top I'm not sure how I feel about. Although there are already pretty simple command line functions out there that will put it back where it was. I use Firefox at work and really like it of course my only other choice without prior consent from IT is Internet Exploder which I will never use. On my Mac at home Firefox just doesn't do it for me.
Anyways the best part. It's fast. Lightning fast. never seen such a big performance upgrade in a browser update. Give it a try. I'd be interested to try it out on a PC as well.