Very practical it avoids opening the micro USB connection hatch and preserves the tightness of the phone. Connecting rather delicate, almost impossible to do blindly. Once connected it holds well, one can manipulate the phone without it detaches. The slightest tension will lift the cable anyway, but without damage.
Small flat on both controlled cables, one of the two was the cable that comes out a little through the magnetic plug, not matter much in all cases.