But I tried it on Windows, and it looks... Simplistic at best. I haven't seen much performance increase, though since I was on Windows I guess I kept looking for the speediness of my Mac. It also has its own little GUI, but the address bar was pretty neat in being able to fetch website names before you even go to the site. I still like Firefox's "Awesome Bar", which displays the titles of the pages instead of just the URL.
Safari is great for the Mac with it being so integrated with the rest of the computer, I like that when I download DMG (disk image) files it automagically mounts them so I don't have to do it, and it also extracts archives and deletes the original archive for me. Just a nice time saver =] I don't like how it switches tabs though, you have to hold Cmd + Shift + ] (Cmd + }) which is annoying since I have to use both hands just to switch through my tabs (in Firefox it's Ctrl+Tab).