My problem with it is that I find scrolling downwards, on either a wheel or the trackpad, infinitely more comfortable than upwards. As I mainly scroll downwards when reading docs / web pages, it now means I have to do the uncomfortable two-finger flick upwards constantly, instead of a gentle downward movement.
On the iPhone it's ok as my hand rests in a position that's conducive to upward strokes with the thumb, but that's not the case on a Magic Trackpad.
Really unsure about this. Should I force myself to retrain?