I've posted this comparison before but not in its own thread. The results are pretty interesting. From my experience, the high roll center works much better in all conditions. I haven't noticed any jacking. This comparison helps show how it effects axle location during articulation:
Front - 13.3" from ground to roll center
Front - ~30" (actually a trackbar)
Rear - 19.75"
Rear - ~30"
Front - 13.3" from ground to roll center

Front - ~30" (actually a trackbar)

Rear - 19.75"

Rear - ~30"
