I just got it after Steven Colbert's guest last night mentioned it I'll probably keep it even though my favorite toolbar isn't compatible...
*update* (sorry for the double post) ...and, the day is officially over! As of about 5 minutes ago, the final score for Download Day is 8,252,518! Good job, Firefox 3! You beat your previous "record" by 400%.
I don't particularly care for the fill-in-the-blank searches, myself. But personally I like dirt cheap simple too. Apparently it loads fast, doesn't take up alot of memory and might as well be the second coming of Christ for all the love and hype it's gotten on some message boards. *shrug* If you're into upgrading go for it, if you're just happy with what you've got... well then.
Well, if your compy sucks, it may take a little bit longer than FF2 to load, but it's still better than IE and kicks AOL's ass as far as my experience goes. Haven't tried Opera, so no comment here. Still, I love FF3, so I highly recommend it.