HD Kobo Fire 8 HD

I am thinking of buying a Kobo Fire 8, but living in the Netherlands means I do not have a an opportunity to try it out somewhere. So I hope you don't mind me asking maybe some very obvious questions.

My first question is about the voices in text to speech. Do I undertstand correctly that Amazon now uses Ivona voices? Which are installed. Can I buy new voices and install them myself (mostly interested in Amy).

My second question is about reading pdfs on this device. What is the average experience? Are there negative things I should take into account?

Thanks!!