Hi Matteo,
I honestly think it's a very good resource, especially if you are in a very beginning of your prep. The guys are doing a really good job of explaining how to create structures and how to read exhibits – which are two out of three of the most important elements of the case (third being math).
However, as it always goes, treat those explanation videos as examples – do not try to learn any of this by heart. And once you go through them, start practicing with other people (or coaches) – only practice will improve your performance.
Hope this helps!
Best,
Daniel