I got a free invite to try out the factor tree, and did. I am not lying it was pretty good but my daughter doesn't like it. She plays on it bor about 5 to 10 minutes and then she wants to do something else. On top of that, when she is playing on it she needs my constant supervision as she doesn't have the spelling or reading skills answer the questions. It would be much better is instead of the program asking how many rectangles there are it had a picture of a rectangle and a colon.
I am a bzz-agent and am getting promotional material so I can give an accurate account of my experiences with the product. The thoughts and writing are my own and not that of the factor tree.