So far, I'm liking it, but it isn't as good as LJ. I know all the features aren't up yet, so it's bound to get more interesting, but the site isn't as (and won't be) as customizable as LJ. That's the main thing so far. I like the simple profile view and the fact that you can organize all your blog entries.
Do you want an invite? I have one to give away. First one to comment with their email address gets it. :-)