I agree it is fantastic, but have found the same issue as was noted here with 1 small additional issue:
I had a very large audio file, 30+ hours, I requested it to be sliced into 10 minutes slices. When it was done and loaded into itunes to load on my shuffle I saw most were 10 minutes in length, but some were 9:xx and as small as 5:xx minutes. I have started listening to the files and there have been gaps in the sliced audio which would indicate the times were correct.
Is there any fix for this, or did I do something wrong?