I thought M+ actually increased the precision of the pointer, too.
AFAIK the "pointer" is a camera inside the Wii controller and IR lights on the sensor bar, this wasn't upgraded with the M+.
The M+ adds a "gyroscope", which is a very accurate way of measuring rotational changes, but it 'drifts' so using it as a 1:1 pointer wouldn't work very well.
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My own choice for motion controller that I'll buy is 'PC mouse' (when this one fails) - but it's not on that list .