They hold the controllers very firmly and work great. Bumper buttons have a sponge inside instead of a real spring, so they can wear out quickly. The entire handle is hollow, making it unnaturally light in the hand. A little weight is usually added. I loosened the 4 screws, separated them and hot glued the lead bus which I cut in half. After assembly, the controller felt much better in the hand. You can also use multiple pucks inside. I can upgrade the sponge to a feather, but I might overdo…