Yup...they work as advertised but they have some issues. Be careful when wading in or out while on shore dives as they do make for a lot of resistance when flipped up against your shins and I have nearly ended up on my nose a couple of times. I have adopted a sideways kind of shuffle when in shin deep water and I take my time. They lock easily, usually on the first kick and they haven't some unlocked on me yet. They are great for cruising around the beach and you get to put on your fins before you put a load on your back. You also get to take off your load while wearing the fins as well with no tricky balancing issues. Quite tricky going up ladders though...I think I will be taking them off before I attempt a boat ladder again. Quite easy to unlock....just pull on the tip as if you are releasing a cramp and pull. When shore diving just stand up on the bottom and take a step and wait a sec..they quickly rest up against your shins. I guess my only real issue with them is they don't seem very durable. I have only 10 dives on them and they are rather beat up and some of the plastic bits on the foot pocket have broken off. As well, both blades have kink marks (from the down kick) across them and they have a bit more droop and flex because of that. I'm not sure how much time I am going to get out of them.