I've been looking for a chassis for school workshops. Thus we needed something with easy access to the control system, a chassis that could potentially be torn down and rebuilt, and something manageable by one mentor with a small car (aka me). This chassis is just right. The electrical system mounts on top, and a full FRC control system fits into the area, while the robot is small enough for the seat of a car.
However, in the first session, students tended to over tighten the bolts causing the peanut extrusion to distort. Also, the battery mount isn't ideal, and needed some modifications; and it only fits over the omniwheels, resulting in significant loss of traction on the drive wheels.
Overall, a very good chassis. Our first session was with seven 13yo students, and we were able to construct the frame and control system in a school day. We've had similar results using the AM14U3, but only with bigger groups of older students, and thus we were very happy. As were the girls. :)