iStartup is an unique class with a great professor. The grading is generous as long as you follow instructions. Not much work: you'll read about 1 case/week (10-12 pages) and discuss it in class, have three group presentations that will each require about 5-6 hours of prep, and a few online quizzes which are pretty straightforward. The 'simulation' probably isn't what you're thinking, but it makes the format of the class pretty interesting.