This is by far the most useful piece of shareware I have ever downloaded for personal use (I couldn't live without Passenger at work). I tried the demo by putting together a 2-disc audio book in 19 minute chunks (the unregistered version has a 20 minute limit). It worked flawlessly, so I gladly paid the 10 dollars and began building usable files. I had many audio books that I had ripped from CD's and ended up with many files that were a pain to keep track of on my iPod. If you copy your audiobook cd's to your iPod, you MUST buy this. It will be the best 10 dollars you ever spend!!