My Take
Overall, there are better adaptive math programs on the market than DigitWhiz. While the game-based program is attractive to students, the games are relatively simple in concept, and students will lose interest quickly. The depth of knowledge addressed in the games is fairly shallow, and there doesn't appear to be any real-world connection made. The curriculum is not very extensive, so learners who are relatively far above or below grade level will be out of luck. Bottom line: have this in your toolkit, but leave it on the bottom shelf.
How I Use It
Your students will be interested in this DigitWhiz, which is game-based rather than lesson- or problem-based. The activities on the site have a kinesthetic feel, engaging students in tasks like moving objects, ordering numbers, and sizing pieces. While the site makes recommendations for games based on a students' individual profile, I wouldn't call it truly "personalized," as it does not seem to give students feedback on their errors or adjust to their performance. DigitWhiz would make a great when-you're-finished activity in a classroom, but I would be hesitant to use it as a priority tool.