The console is very quiet during normal operation but also in the game, the graphics performance is extremely comparable to good computers. The operating system is similar to the Windows 8 very strong, and is in the beginning a bit strange. The games I've run all the beautiful Ruckelfrei and with top graphics. Also Kinect convinced me by voice control Kinect games even I have not tested. The controller is in great hands slightly worse than the old 360 controllers, but otherwise there is nothing to complain about.
I was long undecided whether it should be an X1 or PS4, have me but now opted for the X1 because of their ready availability and the games appeal to me more.
My conclusion: The Xbox One is a beautiful piece of hardware, and the performance is great, more needs not a gamer.