My 4-year-old enjoys this toy. So far I've put all the bugs in it, but he puts inanimate objects in all the time to see them under the magnifier and likes to open and close the slider. The only usability issue is that to see something through the magnifier, it has to be somewhat centered, and that can be a challenge because the slider is slightly bowed upward and things tend to slide to the edges unless it is held perfectly flat. Nonetheless, it works well enough to inspire my 4-year-old to ask for nature walks.