I heard about this mouse being the new favorite among pro players of FPS games, and I assumed it was only really useful if you were at that highest level. I was also pretty hesitant to spend more than a hundred dollars on a mouse, but it's turned out to be the most useful purchase I've made since a 240hz monitor.Elephant in the room, this is a wireless mouse with a wired option, however I barely notice because the battery life is incredible. I play games for a couple hours a day when I'm not working, and I only need to charge it overnight once every 2-3 weeks. A wireless mouse also means you don't need to worry about cable management, or yanking/kinking the cord. I play games on a very low sensitivity, so just this fact was a life changer.This mouse is insanely light and smooth. I use this mouse for Counter-Strike: Global Offensive, so I need something that's light and quick. It should go without saying it has 0 input lag. It's like moving butter across ice. I underestimated how much better it would make me at every FPS I played. I feel like until now I was handicapped.It also has compatibility with Logitech's mouse software, which I highly recommend as it's loaded to the brim with useless features like macros and such. Now I should also mention this mouse only has two extra buttons on the left side, so if you're an avid player of say, a MOBA like LoL or Dota 2, or RPGs like World of Warcraft, this probably isn't the mouse for you. That being said, this is an advantage for me because my muscle memory when I'm shooting at someone is to grip the whole mouse, so if these buttons weren't so few and small, I'd be pressing them by accident, which with this mouse I'm not.If you're an avid FPS player who wants to improve, this is your mouse of choice.