The fins are excellent. I use them for freediving both at great depths and shallow ones. I used to have cheap flippers and I wanted to finally move to something quality and professional that would last for years and, if I ever wanted to make a change, I could simply remove the blade and upgrade it. The change is huge; the first day I tried them I thought my purchase was a failure. Quite heavy (compared to my old fake fins), incredibly large in size (almost half my height, standing upright they reach about my waist?, if I compared them to my old fins these seemed like beasts!). I tried them in the sea with very big waves and the first time was brutal. But from the second time on, when I tried them again, I didn’t regret it for a second. At first you need to get used to them and find the technique.. everything else falls into place on its own. In the dive they are amazing, they provide very good propulsion, don’t tire the leg, and have incredibly smooth movement at depth. Worth every euro. I haven’t tried them in spearfishing activity because I don’t do that at the moment, so I don’t know their ability in that area, but for diving they are top. They need time to get used to if you haven’t taken something similar before, but once you do, this upgrade is tremendous. I definitely recommend them. Also very positive is that I found them in a small size, since for women companies don’t make small-sized fins and that had been bothering me. I always wear them with a sock for better fit and thermal insulation!.