It's working good with Kindle, no bug found so far.
The best one...that is it!
I really like the voice. It sounds very clear. Just a few minor glitches like voice volume going up and down occasionally and some speeding up on some words, but overall the voice is very good. If Voxygen could get their voices to respond to tags such as exclamation points, quotation marks and question marks it would make listening to a book much more enjoyable. I'm hoping an update will include this upgrade. I am looking forward to more English TTS voices.