When they are new, the bottoms tend to be slippery, so be careful if you are diving off a boat. I'm on my third pair of Seawing Novas, due to the fact that a rib occassionaly tears. My LDS says I'm the only one that has a problem, so it may not be a prevalent problem. However, ScubaPro has replaced each set that I returned. I am a hard diver, and will dive in rough seas and against current. I've made over 600 dives since the fin first came out. I love them and will continue to use them. They are light, give a great kick cycle on both the up and down thrust, and pack easily for trips without adding as much weight as other fins. They are a little shorter than my Twin Max split fins.