Arkan T completed this course, spending 3 hours a week on it and found the course difficulty to be medium.
Nice, gentle, but challenging course for absolute beginners in UI design. The videos are very nicely done and looking at the design, these are videos that wouldn't get stale in a few more years.
Some design background helps, but if you're not a designer, you could probably ramp up to speed by looking at others' works and reading free online article yourself. I find it very beneficial that I could take and retake tests as often as needed, as the peer feedbacks given are very useful. I used a free vector software called Inkscape throughout this course, and also Google Slides to build the PDF files.