Hi Pete,
a friend of mine has had one from new (02 model), he's never had a days problem with it.
Regarding its ability in the sea, in very choppy seas it will cut better into the waves than most other boats, but the down side is that the V hull will not be as fast as the flat bottom Sea Hog boats. On Anchor they,re a lot safer than the V hull in a rough sea, but the flat bottom will give you a more steady ride.
His boat has the Mariner 75 4-stroke, his top speed is 37 mph.
If you're interested, I know he's got it for sale for 14500, this comes with the baitwells, one seat, anchor & chain, fishfinder, compass, gps, integrated fuel tank, trailer, etc.
His number is 086-8364252,
The boat is in Bray, Co. Wicklow.
Hope this helps,
Brian
http://www.crabrock.com