I have. For several months, now. I just love to see my daughter, 8 years old, so engaged and confident with Math. And her brother, 10 years old, doing great, loving Math. I thought it was expensive also but then I realized that is much cheaper than Kumon and its problems get into Logic, problem solving, etc. I have to say that being from Spain I could read something about them because, as I told you, I also found that it was kind of expensive at the beginning. So I could read that the European Comission has chosen them to research about on line Education and also learnt that Barbara Oackley, the author of Coursera Learning how to Learn, is a great fan of Smartick.