This Lego set looked to be a lot of fun. A remote control off-road crawler. It's part of the new Bluetooth based Technic Control+ motors / servos. Currently, it's an closed system where only certain model Lego sets (three to be specific) are supported, but it's my understanding that in the future, Lego will expand Control+ to be programmable. In the meantime, it's not so bad because we know what we get will work 100% out of the box. Note that we were not super early adopters, and that the firmware on the control / battery module updated upon first running the smartphone app. The app is available on Android and Apple. Here's a video of the build and some offroading. Note that we changed the gears slightly for to trade off top speed for more torque. The truck is kind of neat because it's actually a great teaching tool for real 4x4 off-roading (we have a Jeep Wrangler in RL): traction, approaching obstacles, ground clearance, gearing, locking differentials, limited slip (the Lego doesn't have a limited slip or locking differentials), etc.