On a flat surface with a small camera the unit I received worked fine until the transition zone where the motor passes the outer support. At this point, the engine noise increased significantly and began to vibrate. I spent a lot of time tweaking every possible setting and experimenting with different speeds and controls in the app and manually. A lot of people like this slider, but since I returned my purchase I've seen the same issue reported multiple times on YouTube and in reviews. It has a design flaw that sometimes produces chamber shakes or increased vibration noise when the engine runs over the outer strut. I am disappointed because without this problem this is a very good device.