Im so glad we bought these as trainers and to try our hand at drone piloting. My son and I both have previous RC experience with airplanes but the two extra channels, altitude and rotation ( yaw ) throw a whole new dynamic into the mix. These units are really tough. We've slammed them into everything around the house for at least 50 flights without any breakage or issue. Spare parts are ready available here for cheap ( frame, batts, and props ) Practically impossible to break the shrouded prop on this model unlike others that only have prop guards. Perfect indoor trainer. Great value for the price.