It runs neck-and-neck with the older 6.5-06, and is a favorite for long range (1000) yard target shooting. The USMC was even playing with it for a while. The beauty of the 6.5x284 is that it fits in a Remington short action, compared to the 6.5-06.
Norma, Lapua, and Hornady offer factory brass for the round.
Chuck Hawks does a good synopsis of the round:
http://www.chuckhawks.com/6-5mm-284.htm
His load data is a bit light, because I've run 140gr bullets right at 3000fps from a 6.5-284. Load data closer to what I've used:
http://www.accuratereloading.com/65284win.html
And the picture of the round: