My four year old loves math and electronic gadgets and Math Shark was a hit with him!  He currently likes doing the easier levels of addition and subtraction and I like that this product will grow with him as his math skills develop further.  It is convenient and educational - wonderful for travel or just small outings where waiting is necessary (like going out to eat).  My six year old plays with the Math Shark occasionally and although she's less a fan of the product (because it is dedicated only to math) that is also another plus for the parent - you know your child won't be switching over to some mindless ice cream game instead of practicing math if you have the Math Shark vs. a tablet.  Also, this product makes it so much more fun to do math drills than having to use flash cards.  I would give this product five stars if the display screen was clearer - the numbers are sometimes hard to see/distinguish. Overall,  this is a product I would recommend.