If you are using a large CRT, then a dark tinted window has another very nice advantage... When playing vertical games on a horizontally oriented monitor, it doesn't appear to the player that the screen is pasted in the middle of a monitor with the incorrect orientation. A 27" monitor will provide a vertical game image which is very close to 19" and the dark plexi hides everything but the actual game image. You really don't even need a screen bezel. This is also a benefit for those who may not have room for one, based on the monitor/cabinet width.