This drone is not for beginners and requires you to understand the parts of the drone and their functions in order to play it and you will also need to spend some time modeling in order to know how it works properly. I liked it at first because it's tiny, runs on two 1S batteries, and moves pretty fast. However, after a month I noticed that it rolled over on takeoff (propeller checked) and after a few tries it took off. The problem became more apparent and to the point that my 4 engine started stalling. On one of the last flights, he went out of the air in a spiral and crashed. Now the motor spins sporadically. After checking the forum there seems to be an issue with the design of the Emax AIO board that the ECS fails on the motor and the only way to fix this is to replace the entire AIO FC board.