Using it right now, it's nice, but I don't see an incredibly huge difference from FF2. The menu user interface looks different, the drop-down list of previous URL's has the site title and icon, but it renders pages the same (I tried a MySpace page that actually took LONGER to render than it did in FF2 by a long time, maybe it was building a cache or something though). Maybe it renders pages faster, but FF2 ran so fast on my T9300 that I don't notice any difference, maybe I'll notice something when I try it on my Pentium 3 or Sempron machines.