I have used it. It just changes stuff you can do yourself in the game. It's good for people that don't want to mess with things, but you can do a better job yourself because of your personal preferences about what is good to you verses what Nvidia thinks is the "optimal" settings. Plus, it likes to crank up some settings that don't make a difference in my case like AA x 1,000,000 when 2 or 4 is fine by me.