I think these power paddles are amazing! I have only recently purchased these but I have been able to test them out several times. I personally found these hand paddles very comfortable which made them very easy to use. However I would consider which size hand paddle you need (depending on your swimming goals) before you purchase, because that way you will get the maximum benefit from them. The only negative thing I could find about this product is that it may come of a slight nuisance to adjust to begin with depending on how big or small your hands are and how tight/lose you want them, but once the paddles are adjusted correctly you shouldn't need to adjust them again. I personally brought the medium size paddles as I want to build up my upper body strength, and being a competitive masters swimmer I really feel as though these paddles are very beneficial in helping me develop and achieving my goals. You definitely feel the effects of the paddles as you use them. I highly recommend that you give them a try!