I use my Jetfins (with spring heels) 99% of the time here in Thailand (and Malaysia, Indonesia, The Philippines, Maldives etc). The water, generally around 28-30 degrees, never dips below 24 degrees Centigrade and I wear a 3mm wetsuit most of the time. The Jets have never given me troubleyes, they are heavier than most but they are tough, compact, and easy to travel with. The only time I ever had any trim problem was the first time I used my Jetfins in the G.O.T. at New England AquariumI was wearing a 3mm wetsuit back then too and the Jets were heavier than I expected; I was also forced to wear more weight than I was used to. Am so used to the Jets now that I wouldnt trade them for anything else. Having said all this, I will occasionally use my Apollo Bio-fin Pros when diving in the blue looking for mantas or when I anticipate a long surface swim.