Go try it at OEX in Sunset Beach and bring your old drive. Compare them side by side and you'll see the difference. If possible, bring a gps unit. You're not going to believe how little effort it takes to maintain cruising speed.
I'm sticking with the ST fins for now. The only drawback I see will be in the surf launches and landing. I typically pedal in and out and try to beat the waves.
I can cruise at 2 mph and not feel any fatigue with the new drive and ST fins; however, it does take a noticeable effort to accelerate quickly (for example, in surf launches). In general, the ST fins have a "harder" time at getting up to 4.5 mph. It's like you have to take a ridiculous amount of strokes to get there (pun not intended).
I'll use the ST fins this year and see if I need turbo fins at all.
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