I just had my new 224 in the open waters of Grand Lake in Oklahoma. It's not really open water but huge lake with high winds. 3 foot chop and white caps was not bad at all. Trim up halfway and move about 20 - 25 mph and things went pretty smooth.
These are NOT as smooth as a Horizon going through rough water as they are not your typical V-nose. I can tell you it operated much much better than my smaller Horizon and when you take into account the immenities, size, and price I love it. I don't know what kind of rough water your talking but it did good.
_________________
2008 Four Winns 224 Funship 5.0 GXI/DP Black w/ Tower
2007 GMC Crew Cab Short Bed / Bose Ed.
2007 Fourwinns H180 (SOLD)
"There are no stupid questions, only stupid people"
