I have run my Sonic at top speed in 6 foot waves when the entire surface of the ocean was white with blowing spray. At idle speed waves were coming in the boat and my wife was panicking. I had her go in the cabin and wedge herself in, then opened it right up.
Smooth as pie, screamed right over the tops of the waves, spaced very closely together. A 50 foot police boat was rolling 90 degrees and looked like he was going to flip over, so I screamed in for a close look, he waved ok, and then I sprinted for the island.
It was THE most exhilarating boat trip in my life. Of course I have also been in 6 and 12 foot breaking waves spaced farther apart, and then it is fast idle time and alot of praying to King Neptune.