I bought one of these cars for my 6 year old grandson who has been asking for one since April. He loves it. Can put it in his pocket and take it to school. He will not trade it, though because it has value to him. I'd like to get him another so he can race them. Play value is limited if there's only one, but still fun.
Pro's: Easy to set up. Has a case to put the car in.
Con's: #1...BATTERIES, they will be expensive to replace. They are little watch batteries. I would rather see something rechargable. #2...Only rolls on a hard surface. Limited playability.
#3....They offer about 5 minutes of interest to my 5 year old boy. Even less for my 7 year old boy.
You can get bigger cars that alleviate these concerns for the same price or a little more.
My sons were captivated by the TV ads for Stealth Rides, so we picked them up as birthday gifts. They really are small, and the controls take some getting used to. However, they were fun, but the price seems high (I bought ours on sale, but still...). $15 would be a better price point.