The Power Grip truly does provide 3x the battery life of your current DS battery. In addition to this wonderful feature, the Power Grip is the best grip addition I've see for any handheld. The installation of it takes less than a second and it is just as easy to remove. You simply snap the 3DS right in place. You can't put it on wrong. The only thing that it blocks on the 3DS is the power input, which is necessary since it supplies its own power input that charges with the normal 3DS charger. All of the rest of the buttons and the stylus aren't blocked at all. The design of the grip is such that it provides channels on each side for you to rest your supporting fingers in so that they never get that numbness that I found starts after several hours of continual play on the plain 3DS. The soft coating of the grip makes it very comfortable to hold for hours and your hands never get sweaty. Personally, I find the size that it adds to the 3DS is just perfect for my hands. It's not too big to hold at all, but it gives it just enough size to fit perfectly.