To be fair to Moz, I decided to hold off everything (from nightly builds, to reviews, to screenshots) and wait until 1.0 to dive in. Well, today marked the release, and I was lucky enough to snag it before everyone else did.
I am sorely unimpressed. First, the load times were nice and fast. Comparable to IE (seemed the same to me, but that's just judging by my internal timer, nothing exact). Then it loaded up. Wow. How unimpressive Mozilla looks. Just like old netscape. If you are up against Opera and IE, I'd change the app design to something new and flashy, not dull and ages old. I'll have to go looking around for skins, I guess. The page loading is, again, comparable to IE (this time, though, it seemed to load pages a touch slower).
Things that annoyed me were that hotkeys were different from IE. I wanted to open a page, so I hit CTRL-O, and a "Open File..." dialog opened. Opening a URL is "CTRL-SHIFT-L."
So it looks like a decent browser, and I'll put it through better trials later this week, but as of a first impression, I'm not switching, yet...