The kit, being nearly entirely modular, is easy to build with the interaction of the stackable Arduino "shields" to control the motors and IO straightforward to follow. The frame is reasonable, and while a little tight in places, better than loose.
The bushes to mount the drive train to the motors were the wrong size, requiring the motor shafts be trimmed to get the parts to fit; there was no way of drilling out the bushes given such small tolerances.
Programming the unit via USB requires the Bluetooth model be removed and the error given via the Arduino console isn't particularly helpful to diagnose this problem. It's at this point the limitations of the kit become apparent. While the build, setup and operation is fine, there is little consideration for troubleshooting, calibration and testing supplied. Unless you're reasonably confident both coding and debugging circuits that may present considerable challenge and require great patience.
The code supplied to control the bots various functions works just fine, is clear enough to allow the user to understand how the bot works. There is enough related info online dealing with ultrasonic sensor modules and Bluetooth comms that learning how to modify the code is quite accessible.
While functional, the code supplied is rough - very rough - and gives ample opportunity for improvement and optimisation. This is unintentionally a great chance to learn coding skills for Arduino and interacting with sensors.
The bot has sufficient room expansion so you can add additional sensors and modules to expand the project. Overall the kit is great for the AUD$76 paid and will keep me and the kids entertained for a while yet.
Not recommended for someone after a functional toy robot; this is definitely a hobbyists product for those interested in IoT, Arduino, programming and electrical engineering.