About the NotebookLM... It is responsive. If I give it a few hundred words to chew on it responds with an analysis within moments. Now I don't at all expect that sort of response from a person who is assisting me in writing, but it is certainly, I hope, helping me drive my story forward. The LM may well hare off in crazy directions and make interpretations that seem to me to be out in left field, but it is very good at keeping me on task!
I shan't use the model to directly write, but it is definitely a tool that I am liking. I might like something that was a little more able to do the thing I hoped for in the first place, but having a research assistant that can read my text and find names, even if I haven't got an exhaustive cast of characters is very helpful.