The new Safari beta is, indeed, quite speedy:
Using the new Nitro Engine, for example, Safari executes JavaScript up to 30 times faster than Internet Explorer 7 and more than 3 times faster than Firefox 3 based on performance in leading industry benchmark tests: iBench and SunSpider.
That said, my Top Sites are far less interesting than Apple's examples (this very blog, Google, and our internal FogBugz are in my top sites, for instance), and I'm not sure that I share Apple's fascination with Cover Flow-style interfaces, but I can ignore that--I've been a devoted blank-page-in-new-window browser user for years, now. And the new tabs, well--I'm still adjusting, to say the least. I keep feeling as though I've lost all of my open tabs, because they're not where I expect them to be.
But: new stuff!