(See Miter Saw Crown Molding Cut Guide for details). (hgtv.com)
When you purchase a chop saw with miter cut capabilities, you're really getting two devices in one. (geekwrapped.com)
And using miters you can get a great looking box beam mantel that is a fraction of the weight (and cost) of getting a true full sized solid beam. (fixthisbuildthat.com)