First: It doesn't fit the slot on the Rift S controllers, it's too big and bulky to fit so you can't put the battery cover back on. Second: When you put the strap on, not only is the controller battery cover now askew, but due to the location of the straps, it makes it difficult to reach the buttons and joystick on the controller. I have average sized hands and the strap moved them so far down the trigger was out of reach. Third: Don't be tricked, this is not like the index controllers where your hand is held in some comfy foam, it is just a belt to strap your hand tightly and awkwardly to the controller directly. Fourth: They want you to put the other part of the strap on the controller ring, resulting in a lot of stress being put on it which will likely break over time.
Do not buy this awful, cheap, garbage. I will be returning mine.