This product generates no backlash. Most rotary transmission components like belts and gears are known to generate backlash. The attraction force between poles used in this product will only slightly vary and it will depend on alignment of corresponding magnets. If one pole is perfectly in line with the pole on other unit the force is at maximum and it will slightly decrease when the unit is in a transition point from one pole to another.
It may affect the position, but only marginal deviation will occur when some drag force is present. It is not considered as backlash, but more as an angular resolution of each of the magnetic poles. Therefore, if the product will rotate 360 degrees, it will always end up in the same exact position.