I bought this for my 11 year old as a Christmas present. The package arrived undamaged, all parts are in excellent condition. The assembly is quite difficult for kids, especially the camera module, but they can do it with the help of their parents and some help. The printed instructions are incomplete, but the Revain setup videos have all the details. The app was downloaded from the Apple Store and security is not an issue for iPhone users, we have not tested the app for Android and Windows. We tested all the sensors and the camera and they all worked well. We've thought about updating the WiFi password, but not sure if it's feasible. Haven't tested the battery yet but will upgrade to a larger capacity later if it doesn't last long. Burning a raspberry pi system is easy and the website has it all, you just need to download the zip file and you will find everything you need in the unzipped folder. For now it's just a fancy remote control car, having just downloaded the system provided by the seller. My son is very excited about it. But later I will copy the Freash Pi and help it learn to program and let it try all possible designs of these sensors. We haven't asked the seller for help yet, so we're not sure about after-sales service. But we are very happy with the purchase at the moment.
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