I've been using it since the beta and I've not had any problems with it. The status bar being removed was initially annoying but they added that little popup after a few builds and I've found its good enough for me. I've gotten used to the tabs at the top but its easy to change as Tony said.

The stats page that Tom linked to is pretty cool.

Anybody using Firefox Sync? If so, are you using the public Firefox Sync servers or hosting your own? There is a tiny Weave server along with the full enterprise level you're handling thousands and thousands of users server.

One final thing. I remember there was a big deal made of Firefox 4 and how it was going to be the first Firefox that would have an official 64 bit public build but I don't see anything about that now. Not that a browser really needs 64 bit. Just curious as to why that disappeared.