I echo Blossom's sentiments, I love this plug-in to DEATH! I read a ton of series and before this plug-in, I was going to Fantastic Fiction or someplace like that to find out the next book in the series.
After the plug-in, I am able to literally set up the series and then all the books contained in the series are in order. No more guess work. It does take some patience to get the plug-in set up correctly or more importantly, customized to how YOU want to see the books/series displayed. But the end result is AMAZING!
Here is an example of how it looks when done (again, you will need to customize based on how you want the books to look):
