I tried it on some jav with index tts 2.5 when it came out. Mostly out of curiosity really. I gotta say it's pretty decent, not perfect by any means and hard to get right but viable-ish, crazy how fast this stuff advances really.
It's impressive how AI is staring to preserve the actual voice and performance of the actress. But it does take away quite a bit of realism too. So a tradeoff between not having to read subtitles and worse realism. Though I do find reading subtitle very immersion breaking too.
I'm a bit mixed on it in it's current state. I can imagine this being cool once it gets next to perfect though.