I bought these after being extremely impressed by the quality of the SS EZ bar. Suffice to say, I was not disappointed with these. They are extremely sturdy in construction, yet easy to load and unload via a rapid dual-pin system, which releases the handle and weight plate in turn, allowing you to load or de-load. I use these instead of dumbells, and it's worth noting that they are longer than regular kettlebells, and the handle is a bit larger, too, so I have learned to slightly adjust my grip and hand positioning accordingly. The increased tension time and growth stimulation you can get using these for chest flyes or different biceps/triceps variations is remarkable. They are also great for weighted carry variations. I am delighted I bought them.