I bought 2 of these sets for my kids and they love them. Pros - 1. A sufficient number of parts to create a good design; 2. Cool flexible sticks concept; 3. Sticks glow in the dark; 4. Connectors have a variety of integrity that allows you to build curvilinear structures. Here's one, but a HUGE mistake. The connecting pieces are designed like puzzle balls, so they easily break in half and no longer stay connected. After less than 2 hours of playing time, at least 10 connections were interrupted and could no longer be used. I hope the design can be improved as the concept is in the right place. Both sets must be returned.