"How does this boat handle rough water?"
Hard to answer a general and mostly subjective question but I will try. Much better than our 19' Nautica flushdeck deep "V" does in any and all cases. On a test drive yesterday we cruised over 1-3' variable and tight mixed sea chop when one of the new 'passengers' commented that it seemed to 'float' more above 20 mph as the hulls rose and softened the incoming wakes and waves.
Compared to boats of its size and weight the handling is very good, spray is minimal, roll is much better, most head seas are improved , following and quartering is much better.
Hope this helps