I like it so far, there are some improvements I think would be helpful though I understand they may take a while to implement if they get chosen.
When it gives feedback on say your answer and corrects your mistakes it would be nice if there was some colour difference or highlighting to be able see the changes quickly, e.g the area in your answer that you made which was a mistake in red and the corrected version in the answer in green.
A seperate feature is it being integrated into lessons especially sentences and being able to use it to explain the grammar of a sentence or certain grammar structures and how they work, right now I have to copy each sentence to chat gpt which is okay but slows down the learning and can be a bit of a phaff.