Ventajas
The mission - being part of a company that helps kids learn & understand math is really rewarding; the "story" behind Larry Martinek, one of the founders, is inspiring. Because the company is small & growing, there are great opportunities to get lots of experience in a variety of areas.
Desventajas
Everything starts at the top and the CEO is the absolute worst - lack of a clear vision or plan, controlling, micromanager (i.e. any personal office photos MUST be in the red IKEA frames ), poor/dishonest communication to employees, SUPER cheap (hired MBA student as CFO) and more. This is a growing/changing company. The job responsibilities (and bonus structure) you were hired for could change every 6 mos. "on a dime", as is what happened to me. When I asked about my bonus, I was told I no longer had a bonus structure, although it had never been communicated to me. International expansion is a priority today - the entire intl team gets fired tomorrow, etc., etc., etc.