Very rarely use it. It doesn't support opening more than one window in many instances. (The additional windows it "tabs" end up being blank). Plus, you may find that you have to reinstall Java and other plug-ins as they do not cross over from IE.
On the good side, it works better for opening web-based email that has graphics in it. IE sometimes "cleans" the contents of email from some ISPs and I have to reopen in Mozilla.
I use Maxthon. You can find it on http://www.maxthon.com/en/index.htm Much better than IE and it works better with Java than Firefox. Although Firefox isn't bad, Maxthon is a bit better IMHO.
-Jazhawk
My tabbed bookmarks work fine so far, and no Java issues either. lol the only negative I've found is it makes Drudge look horrible. Not that Drudge's site was all that sexy to begin with though lol.