How I Use It
It could be used as a major part of the classroom. You can easily tell students to finish up to a certain part of the lessons and students can choose to complete more lessons if they feel like.
Overall, the ads do seem like they are out of place, have not seen anything inappropriate though. It would be someone to watch out for though. It is a great tool overall to teach students how to type. It also shows the accuracy and speed they are typing at which can also show how well your students are doing.