L+R buttons stick after correct installation. Apparently this was due to two grip points, one that seemed to be due to the mold not breaking properly leaving some excess and the other apparently due to the mold creating a flat edge around the button (the part which will not be). visible after the shell is lit) is too large. The problem was easily solved with sandpaper and a metal file, but for the price of cheap plastic buttons alone I don't think I need to modify it. When I asked a question about the product, the seller responded by instructing me to reinstall it following the video he made (which I had already used). That wasn't a helpful answer. Overall I still find the product worthwhile as the seller also makes cases and matching joysticks which were perfect.