"I bought this set because it is different from my other sets, which just sit on my shelf, getting gusty, only to be built, and rarely played with. Now, this has the fun of building it, but more after your done, rewarding you with access, almost like motivation, the app, which allows you to control it. The app works well, and there are different control setups, so you can choose the one you prefer. Only 6 batteries and you can pop some new ones in when they die. The app even has a calibration system, shown as "The Workshop", which calibrates the steering if your vehicle is out of sync. My only real disappointment is that TECHNIC missed out on a great opportunity to make this set the first TECHNIC set to include a Minifigure, which could have been the STIG racer from the show. It would've made this set exclusive, and higher in demand. All in all though, It's a great set."