When I first watched the second disc of Haibane Renmei, I was a bit disappointed. Part way through this volume thought that the action had slowed to a complete stop - nothing seemed to happen at all. Of course, I was wrong. A few months later on my second viewing, new things started appearing. Where there was no action or story progression before, suddenly emotions and messages were appearing using pauses, body movements and facial expressions as well as the words. Haibane Renmei works on such a different plane to other series (and I include non-anime in that group) that these things are easy to miss. It is a credit to the director who was able to insert these subtleties so delicately, and only adds to the value of this beautiful story.
Now when I watch the episodes on disc 2 they are up there with the rest of them, the story progression with Rakka/Kuu and the 'Beginning of the World' tangent in particular being pretty special. Definitely, definitely worth your money.