The Game Gripper is extremely useful if you enjoy playing console games on your smartphone. The rubberized pad fits snugly over the QWERTY keyboard. It's not a piece of hard plastic that won't fit in your bag, in fact, the rubberized pad allows you to just toss it around. It's flexible and bends so you can squeeze it into your pocket if need be.
The Game Gripper does start to slide a bit if you press on the keys too hard or too frantically but that's actually a good thing. It comes with a warning stating that you should not press too hard on the keys as it may damage your QWERTY keyboard. The sliding gives you that reminder that maybe you're pressing too hard. When normally pressing the buttons, it feels comfortable and it's much better than trying to use the physical QWERTY keyboard by itself.
Most people would assume a controller such as this would be good for playing simplistic games like Super Mario or Sonic or Zelda, but you can actually perform some fairly advanced maneuvers. For instance, when playing Street Fighter 2, the Game Gripper helps you pull off moves such as the Dragon Fireball or the Hurricane Kick with Ryu, or the Sonic Boom and Flash Kick with Guile. These moves aren't just maneuvers performed by pressing one key, you actually have to move the directional pad and press the keys. Once again, on the physical keyboard, almost impossible, but with this gripper, it's much easier.