Ask 100 people a question on their fin perefence, and you will get 65 different answers, over the course of my diving, I have dove the Quattros-hated them, made my calves cramp, the Slingshots, cool, but I agree gimmicky, though the adjustable spring action is nice, twinjets, I have 2 pairs of these, and the expert zoom ff-9 fullfoot, great for snorkeling, and I keep coming back and diving twinjets, comfortable, accelerate smoothly and fast, manueverable, and depending on color, you can pick your amount of bouyancy from slightly negative to crap these things make me need 4 lb ankle weights! seriously, go to your local dive center, and try a bunch in the pool till you find the ones that are best for you in your price range for speed, comfort and manueverability.