Overall, he seemed to enjoy the experience, giving it an 8/10 overall. There were a couple usability issues that he explores in the audio post below.
From an adult perspective, it seemed like the sort of kids program we can turn him loose on and not have to worry, though it would only really keep him occupied for about 15 to 20 minutes at a time before he really needed help getting into one thing or another that he wanted to do. Still, the system seems designed to be kid-proof, trapping all the function and control keys so that you don't need to worry about the computer being destroyed when you get back.
And that AJ seemed to enjoy the experience - a bonus! He's been begging me to give the laptop back to him so he can play with it some more ever since. Check out his audio post below for more details.