There were some unique courses that I'm not sure I would be able to find in other services

I don't really have anything positive to say. I had very negative experiences with the customer service of this company and I cannot recommend using their service.

There are SO many different courses, with a variety of teachers. Each has video content, with actionable items (usually a project) for you to implement immediately what you learned. There is a class discussion board to interact and ask questions, as well as the ability to see other projects and get additional ideas. You can also save courses and create lists of courses so you can have a working list of courses to engage in for your interests. It also keeps track of the courses you are currently watching so you can jump right back in. There are a variety of lengths to the courses as well, so you can choose how intensely you want to dive into a course at any particular moment. You are also able to "follow" different instructors, and see immediately what other courses they offer. You are also given recommendations to similar courses of interst.