I am glad I waited to give my review. My first week I wanted to give 5 stars but I held out. The second week I got my wife into it. She has learned so much more than me and it is because of a bug. My app is up to date but I have an older skill tree. We study at work then at home we attempt to practice together but our lessons are so different it cannot be done. I have 2 friends who have the same skill tree as her and they are all doing much better. I reported the bug and no action has been taken