I like how it is integrated with other platforms such as LinkedIn or Salesforce so you can keep up in your job even when at work! The interface could use some additional improvements but this doesn't seem too much worse than others out there either way.
Try taking all courses offered by one school if possible at first - they tend not be very different depending upon what department/school within their university offers them. It's helped me get my head around concepts better since each course takes about 15 minutes to learn something new compared to longer books where sometimes things aren't fully explained until later parts.