You don't want to spend money on this controller, or you keep spending money because you have to keep buying analog sticks! This is a good controller when you first get it. Really nice. But as someone else mentioned, you'll find that your stick moves on its own. And if you think you can fix it with an app like you should, it's no easy feat. You have to lift the center of the controller to adjust it, and even then it's not perfect. For the price you pay, the components should last a lot longer than they do. Not to mention that not everything is interchangeable. So x, triangle, square and circle (you know Xbox buttons, if you use a controller) cannot be exchanged. If they go bad or start sticking, you'll need to buy a new controller. Mine haven't done it yet, but as mentioned analog sticks won't hold up. Especially the one you use the most, which is the left analog stick for character movement.
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