At around 2 years old my son began showing interest in computers. His dad is an IT Administrator so our son was around computers all the time. Also, he was (and still is not) interested in learning the traditional way (through books, play, etc.), but rather through computers. We were NOT disappointed with this piece of software! Through this program my son has learned most of the alphabet, shapes, numbers and colors. We have had this one for about six months and he has not lost interest in it.
However, there are some things that I was not pleased with. First, this product is recommended for children 18 months-3 years. It would probably be more suited for children 2 1/2 to 4 simply because it requires basic knowledge of how to use a mouse and the program does NOT teach this skill. Also, the concepts it teaches (letters, numbers, shapes, colors, music, animals, memory skills, etc.) are more geared toward the preschool crowd. Second, the layout is "busy" and it is hard to see all of the different entrance areas (even for me an adult). Finally, another minor complaint (it is very minor) is that the duck's voice can get annoying after 15 minutes or so for me, but my son enjoys it so this is tolerable.
Overall, I highly recommend this software, however, for children over the age of two.