"The building process, via phone, was 'ok' but not the same as using the usual paper instructions. I actually liked the stages of the build, checking moment as you went. At first it was great...but then the batteries died! :-( Wow, that was quick. 5 minutes online and it was swiftly converted to run from a usb charger! Result, that should be an option instead of aaa batteries. So far, love it, and my son (6) was quick to get the hang of the action controls via the app."