The main point of screen protector is to protect from scratches. Doesn't matter how much you read about Gorilla Glass 2, there is still a possibility to get small hairline scratches. If you are careful and have a case with a decent bumper lip (to keep the phone screen off the surface face down) or use one of the flip cases to reassure that in your pocket it wont rub against anything - you can get away with it, but still you are taking your chances. On the other hand, having a cheap ebay screen protector can ruin your phone experience with rainbow effects and marks left by s-pen. So you better go with something more premium if you decide to go with sp (like products from iSmooth or Spigen). You can even go one step further with impact resistance 9H hardness tempered glass, but that is a pricy option. Also, keep in mind that in a year or two when you ready to move on to another phone and want to sell yours - having mint condition no scratch phone makes a big difference. I just sold both of my ancient Droid X and Fascinate over a month ago on Amazon - just peeled off screen protector and took off tpu case, and they were like brand new, a bonus that helps you sell it faster and at top price... Just a food for thought.