After playing with the Safari 3 betas for Mac and Windows, I can happily report: so far so good.
It does seem faster, and the new look of the "Find" function is amazing. Before, when you searched for a word on a Safari page, it was a "Where's Waldo?" exercise to try and find the nearly-invisible highlighting of the result. No more. The highlight is bright and colorful but not intrusive.
For Windows users, it's definitely a speedier alternative to IE and Firefox, and you'll love the clean simple look. Not so much clutter.
As for Mac users, if this is like dipping a toe in Leopard, I can't wait to go swimming.