assuming that you are not cramping miserably, the fins that you are wearing has little to do with the speed that you can attain. period end of story.
sure there is a difference in comfort, efficiency, maneuverability, air consumption, and a small difference at very high speeds (beyond what you can sustain for more than seconds to a few minutes).
now that is interesting. if that were so, why bother and wear fins at all? after all, your feet are somewhat of a miniature fin
Seriously, I don't think this is a true statement. Different fins have different efficiency on converting leg motion to forward thrust.
Problem is that people are different, so there is no single perfect fin for everybody: kicking styles vary, not every fin is equally efficient at every style
bodies are different
strength and endurance is different
what is also a common misperception is that a stiff fin or a fin that gives you a lot of perceivable resistance is a fast fin. Resistance is not equal to creating forward thrust, much of the consumed energy can be lost (e.g. in eddies)
Bottom line: Rent/borrow a few different fin styles, incl. the volo. Try how they are for you. Don't get fooled if a fin feels "too light", it may indeed just be quite efficient!
You don't necesseraly need to scuba for it, many dive shops have pools where you can try equipment.
Of course, other considerations in selecting a fin are cost, durability, weight/bulk.
I had Volos for a while, unfortunately quite expensive and not too durable, started to disintegrate after maybe 50 or 100 dives, don't remember.
I now dive Mares Avanti Quattro for cold water/local, and Oceanic Caribe for warm water/travel (yes, full foot, see my "experience thread").
But there are many choices, reading here will reveal the more popular ones.
