Feedback on the courses offered by SalesAgility

Good afternoon, I wanted to know if anyone has taken the courses offered by SalesAgility on the official SuiteCRM website (link: Developer Training - Try it today!), whether they are canned (series 1, 2, and 3) or customized. My goal is to know what you thought of them, if the course helped you or not, as I want to be sure if it will be useful to me, since my focus is on training at the development/programming/code level.