I used this for exam 4 review and it was genuinely helpful for finding topics I needed to study (although that may be mostly because a TA wrote the questions). Overall it has been helpful to talk through the concepts, so I get a better understanding of them.
At points the bot will ask me a follow up question of something I already explained in an initial response, but that doesn’t happen too often. I did not use the voice feature, since I am wary about the usage of my data now or in the future and that didn’t hinder my use of the site.