We use this app almost every school day. My children have memorized their multiplication tables using this app exclusively, but we have used it for addition and subtraction drills and timed drills also. I appreciate that I can control ALL the parameters of the drills/quizzes, and that I can email the records of the childrens work to myself so I can keep a record of their work. It is the best math app we have, and we have at least 10. Kids do not get distracted by silly nonsense and unnecessary over the top praise, they are able to focus and work quickly, and the reward is a high score, and they are happy with that.
I have used this app from the moment it came out on the iPad, and I have not had any issues whatsoever. Kids find it easy to use, and they enjoy this app over all the others (they actually fight for who gets to go first to use this for their drills).
THANK YOU for developing and continuing to improve this wonderfully useful app.