Am now using 0.6 beta on Kubuntu 12.10 and generally happy with it, some problems here and there but nothing dramatic.

On the Contact List I have a suggestion: I use contact groups a lot and at any given time I have quite a few groups with no online users. As it is now they just take up space in the list. I would suggest an option "hide groups with no active users" in settings.

Keep up the good work!

FYI, you can follow the bug in our tracker here: https://bugs.kde.org/show_bug.cgi?id=315620

Happy to see that it is being worked on!