My Take
It is a great way to be able to do rotations and small groups in your classroom. It is also an educational alternative to free time. They think it is free time because they love catching pets and battling each other, however they are doing math and I am getting data!
How I Use It
I have all of my math students set up. I create assignments aligned to what I am teaching. They play as an early finisher. They have no idea I am getting data from the fun they are having. We have found a problem or two that are incorrect but reported them. Some students do not like it as much as others but the consensus is they enjoyit.