I actually really like them!! The water doesnt swish side to side at all because the inside absorbs it all. Im still not really sure whats going on with it or how they work. I love to do squats with them! I have used a sandbag to do squats before and Iove how the weight stays straight up and down on your body with a squat weight you can grab like a bear hug. The big bullbell is just like that but way softer and better feeling. Oh, one more thing I love is the fact that it's safer! You dont have to worry about dropping a weight on your toe or smashing your fingers!!