General rate: Negative
If you already have the basices, this would be fun. If you are looking to learn, get this with a supplement. This program gives 1 sentence to explain something, then asks questions that probe much deeper. It does include a few learning games. I don't feel it is worth the asking price.

General rate: Positive
I learned so much. Will want to use this with GATE (Gifted and Talented Students)