Well, it's currently still at Beta 11 and the official release probably still a month away, but all I got to say is WOW! For the first time since switching to Mac over two years ago, I can finally say that this thing is FAST. SNAPPY. 3.6 vs. 4 is like day and night, and it keeps getting better with each beta... It's as fast as Safari now, if not even faster a tad bit. The UI is nicer too among other things. One of my biggest gripes about FF on Mac has always been the browser speed. It was noticeably slower than the competition (although some "homers" kept insisting it wasn't slow). The UI was kind of ugly as well, and all this prevented me from wanting to switch to it. Oh, and worth mentioning is also the launch time! It has improved greatly, which is awesome. All I have to say is that I'm really happy with the progress they've made and will probably be switching from Safari once the official version is out. Anyone else tried it?