My Take
Very attractive, engaging, kids will love it. Competitive feature will keep kids wanting to get it, and stick with it. Limited in terms of what types of questions you can ask.
How I Use It
One way I would use this product would be as a pre-assessment tool. This would enable me to know where I need to start, or how much differentiation will be required before getting started. I also would use this to assess each of my groups mid way through a topic to establish benchmarks, and determine how much, if any, reteach is needed, and to which group.