We had no opportunity to run wide open offshore, but at prudent speeds, I found the 345 performed admirably. While it didn't like running straight into head seas without any tab, just the slightest trim down made the ride much smoother and drier. The OS 345 handled every other point of sea with aplomb; it tracked down-sea back into the inlet straight and true and both ran and drifted in beam seas very comfortably. In fact, drifting beam-to caused much less roll moment than I expected given the conditions. One crucial performance ability - especially in heavy seas - is a quick, sharp turn at slow speeds so you can reverse direction between waves. The 345 handled every turn predictably and in perfect control.