bought isonic 76 today, 2008 i think.
used today for first time, winds 15/25 knots with 5.0m vapor+lots downhaul.
cost $1200 2nd hand, hardly used.
tried with 28cm carbon fin ,was overpowered in occasional gust.front foot was coming out of strap a little. switched to 25cm fin, much smoother ride solved the problem too.
board is a gem.
good bottomend, extremely fast topend + very smooth ride.
sits a good bit lower in water than f2 sx 80litres, but feels faster.
only problem my favourite 25cm fin feels a bit small, unless 18+ knots.
a great board for lightweights in 15/25.
in stronger i prefer a even smaller board.
if you get the chance buy one.