Not only is it super fast, but it's efficient. It's the first browser I've ever seen to pass the Acid 3 test with flying colors, literally.
The on-board web console looks like a fresher version of Firebug, the industry standard tool for front end web development. Safari's inspector has always been good, but never has it competed this much with Firefox's toolset.
The console is even located in the same place, and acts very similar. To inspect an element, right click it and you can see all of the codes that built it.
One of my favorite features is the breakdown of all the resources that it takes a page to load. If something is slowing down your page load, you can narrow it down easily with this chart:
Have you had a chance to try the new browser? If you are a user of Firebug, please give this a try, and tell me what you think.
I've been using the browser all day as my default dev browser and I haven't switched back to Firefox yet.