I've been using it since it came out and works fine:
One bug: some times when you lost conection and reconect, its impossible to send any msg, you have to close all WLM even from systray, so it will work good again.
another bug: sometimes it's impossible to add new contacts, or if they add you it doesnt show up the request. its not good at all adding new contacts.
Sometimes it freezes easily.
the rest works fine, I like it.