I have never taken the course, so I am not putting this in an answer, but I think the beauty of Matlab is that it is very intuitive. If you have knowledge of general programming procedures (such loops, logic, matrices) I do not think that you'll need a course, and if you don't most colleges use Matlab in some way and often those lesson plans and notes (especially for introductory courses) are easily found online.
If you have basic coding knowledge and just want to learn the Matlab language and are on the fence about a class, start by reading some of the introductory material on the Mathworks site in addition to beginners guides that can be found through Google. Matlab Central is full of resources as well and fun games (such as Cody, which I just started doing) that help you learn tricks of the trade. I have found that just by reading the Answers section and attempting to derive solutions on my own that my Matlab knowledge has expanded greatly. There is so much quality help available online for free that I would definitely evaluate your needs and personal learning preferences before paying for a course.
