In overall both the course and the specialization are good for people who has no idea about this topic, but the introduction is no more than that, and it is in my opinion a VERY light introduction overall. People who already know about Arduino, Raspberry Pi, networking in some level... and with some programming background will find this specialization unworthy IMO.
On the other hand, the teacher explains everything in a very easy to understand fashion giving the sufficient information for students to know how to manage the assignments, and with three hours a day the whole specialization could be completed within two weeks EASILY.
Maybe it is only me who expected this introduction to be focused on engineering students and graduates, but knowing this you should be the one to make the decision of subscribing or not to this course.