I was amazed by how easily it converted an article into voice. It was super quick.
I see several areas of opportunity:

As with other comments, I would keep giving love to the Spanish Voice selection (I'm a Mexican content creator).
I was wondering if there are plans in the future to, besides the rate and pitch, we could give direction to the voices in terms of emotion. I've worked with voice actors before, and those voice inflections definitely add a lot.
It would be great to consider adding an option to pronounce specific phrases/words in other languages. For example, one of the articles I was working with is in Spanish, but it has book titles in English, which are too pronounced in Spanish with a bit awkward sound.

I'm eager to discover more of the future updates for Fliki!