I am considering to use Linguatec Voice Reader professionally to convert long PDF texts to audio. I'm fairly persuaded that the audio quality is good, but how long does it take to convert a 50 page PDF document (for example) to audio?
The web demo doesn't allow you to import PDF files, therefore I can't test it to provide the accurate data regarding the total time for a sample PDF file.
You can test the application using the following URL: http://www.linguatec.net/products/tts/voice_reader/vrs15onlinedemo
To enjoy the full features of the product, you need to buy the full version of it.
Official page: http://www.linguatec.net/products/tts/voice_reader/vrs15