It's great! The application is very stable and works perfectly (except for a small bug due to the registration via AppSumo which made me fill in my preferences several times.)
I have pushed my requests far, but the program proposals (bringing together book summaries and aggregation of content in the form of Podcast) are always great.
The voices to select are great, but beware of the next step: many apps have crashed when they added other languages, not knowing the right and wrong voices from languages they don't know. (I'm looking at you Headway).
The developers have already announced that full localization is coming, but if the new voices don't catch up, it will greatly penalize the sustainability of the application. I am personally waiting carefully for French. But I want to say that the English voices are great.

The application being focused on learning, it's a hundred times better than any generic AI. Over time, I think they will continue to push this area. Why not with flashcards for example and a kind of knowledge bank that would grow automatically with each listening, or selections.

Thank you for this great app, I wish you the best for the future and I'm happy to support you!