This service caught my eye right off. I set up a free 7 day demo account and ran it through the paces. I ran several articles/web pages through the service and it worked great, even with technical medical jargon. I thought it was a great service and ran it by my VP and she loved it. (shock)

A little back story...
I am in the process of doing a complete redesign of website for a large hospital in So. California. I thought this would be a great addition to the redesign, offering the hospital clients the option of listening to the articles on the page, rather than reading. Given the choice of reading a 1,625 word article on Peripheral Arterial Disease, or listening to it - well people are lazy. This also would invite people who are self educating themselves on different procedures to stay 3 to 8 minutes on a page, and not just bounce off. This also would make our website more ADA compliant. There will probably be an SEO boost for the podcast service links.

The only thing I had to do is change some settings on my enterprise CMS's web security settings to allow for the APi calls out to make the magic happen. Other than that, the setup, the execution, and the implementation was a breeze.

I did place a vote for Spanish on the roadmap at https://trello.com/b/vZwHdSyo/product-roadmap. They are doing French right now, and have several other requests for other languages.
The developers are very responsive to any questions on their Facebook page at https://www.facebook.com/groups/buildbubbles