I've chosen this item because of its modern motor shape and its hollow motor shaft. It has a disadvantage though - the cable is too short - 75 mm! It is not enough to get connected with the F40 4in1 ESC (for frame 215 we need to make it 10-15 mm longer). I would recommend to make the cable of 90 mm length. I liked the price, the quality and the package: two nuts and two sets of screws for frames of 4 and 5 mm thickness.
Modern motor design, good price and quality were crucial for my choosing this item. I liked its hollow motor shaft, great package with two nuts, two sets of screws for frames of 4 and 5 mm thickness. Unfortunately there is a disadvantage - the cable is too short - only 75 mm! (for the frame 215 we need 10-15 mm more to connect it to the F40 4in1 ESC. I recommend to increase the cable length up to 90 mm.