I used Jet Fins and Turtle fins for 20 years, then I bought a pair of Mares Quattros, used then for 5 years. Longer, stiffer but no real big difference in performance.
I tried a pair of Mares Volos, Wow. Much more efficient, less drag and sexy Black and gray colors too. I Bought em.
My air consumprtion has dropped 20%. nuff said.
I go just as fast, but with less effort, and my dives are longer.
You can argue I'm just more comfortable or relaxed in the water.
I've been diving for 30 years, teaching since 1978.
I don't think I have suddenly became that more relaxed.
Mike D
:blfish: