I used it for a voiceover in the Polish language. Choices are two female and one male. Classic voices, so authenticity if off for me. The pitch is not working well.
What is irritating is that the app takes away credits for a preview.
I cannot compare it directly to newer generations of TTS apps as I have not bought any recently.
Overall, it does the job with a decent outcome.
For this price, it seems like value for money. I could be more certain if I made direct comparisons to other TTS apps.
But the comfort of having access to this technology in itself is a blessing.