I just got it about 2 weeks and love it. Gmod is an open sandbox game free to do almost anything, but there are servers with gamemodes you can join as well. My favorite gamemodes are DarkRP and Trouble in Terrorist Town. For those of you who don't know what Gmod is: http://en.wikipedia.org/wiki/Garry's_Mod Or just watch PewDiePie play it
I got it about a week ago and used joytokey to set up my favorite Xbox controller. And I would have got it a year ago but my parents just got me a dell Inspiron r17 laptop for "school" . I also have all my favorite old games on it too. So I was a Xbox "FANBOY" but I'm so quickly turning into a PC gamer .