This software has some critical issues which require an awful lot of "prep" to your text, if you want it to sound natural when being read.
For example, if you have a clause that is separated by 2 M-dashes (fairly common in literature), the software does not give you any pause whatsoever. I had to turn all my M-dashes into semicolons to get a pause.
Then, if you are converting to MP3, there are two annoying problems:
(1) The software does not give you any pauses for a line-break (really?), so you have to add a period and a space at the end of every title, or bullet list item, or poem line, in order for it to read naturally.
(2) you can only make an MP3 with 20 pages or less, so forget about it if you are trying to read a gutenberg novel; this is simply too much work to be worth it.
It blows me away that you actually have to pay for this software, when you can turn a gutenberg novel into a computer-read audiobook on a mac for free. And without these annoying problems.
On the flip side, the voices are very nice, and so if you have a bunch of time to prep your text, then download small sections of novel, then join them together into a single file, sure, go for it. I was looking for something that was going to save me time, not eat up my time.