This is the best thing that ever happened to mobile games! I bought these for Brawl Stars as I noticed my thumb hurting or slipping on the screen protector during longer sessions. I have a tempered glass screen protector on my Ganaxy S8+ and it also works well on tempered glass on this phone. I immediately noticed a difference in games. This gives you excellent thumb control. My Poco with 500 trophies quickly turned into a Poco with 600 trophies. I'm better at staying behind cover, not getting stuck in any walls anymore, and I'm even much better at dodging Molotov barleys. If you're serious about competitive gameplay, then these joysticks are for you. They lose grip if you squeeze them too hard while playing, but I just give them a few more squeezes between games and make sure the suction side is dust-free and I'm good to go. Oh yes, my friend plays Brawl Stars with me and after using the joystick she said she never wants to use her finger again. It's also good that they're cheap because they're easy to lose. :pAfter 2 weeks of use, I noticed that the joystick is now slipping a bit. You should keep the sticky end of the pen as clean as possible. Once you drop it and get dust on it, forget about it. Keep it in the box when not in use!