I think this tool if very good as it gives you a roadmap to understand a certain topic through thought-provoking questions. For instance, it asks you certain design trade-offs when it comes to hardware etc. which was very helpful for me.
Sometimes it stopped quite unexpectedly after the answer which I suppose was correct but the summary did not contain the summary of my answer. I think it would be better to have this in the summary and probably some resources.
I also really liked how concise the questions were.
I would like to use this tool more in the feature.