Have used versions 1.2 and 1.3 over a hundred times (I am a Mac admin at Large major TV/Movie Studio, and have made donation for this software...), but I gotta admit, version 1.3 seems like a downgrade in real world use...

Don't get me wrong, I love this app, and recommend it, but I recommend version 1.2.
Version 1.3 has a better interface, but sometimes (over 50% 0f the time), it will just hang, and not do its thing. then sometimes it will show the available names twice or even wrong names. And finally, sometimes the permissions are all wrong on the dmg file and main app, and correcting permissions sometimes helps it launch, but other times, you will just get incessant bouncing in the dock. So back to version 1.2 for me.

Version 1.2 rocks. Version 1.3 is beta, but developer is cool, and I am sure a version 1.4 will come out that will work in Leopard also. And I will definitely use and endorse it again, then.