So far, I like it alot. The tab system is really nice, along with the fact that I was able to import all my IE bookmarks and such. Best of all, it doesn't crash. My only gripe with FireFox is how long pages take to load, but this isn't really much of an issue compared to the other great features FireFox has.
I haven't checked any of the plugins yet, but I'll be sure to check those soon.