You guys missed my point completely. This device is only $300, you can put any video card into it. It uses PCI-E port to connect, so you get full graphics throughput. It will not work with any other device than an Alienware Laptop. This thing basically futureproofs your portable by letting you upgrade to the newest full desktop video card when you want.
I would love Microsoft to build something like this for future Surfaces. I have a laptop for gaming. I also love my Surface. Here is my dream setup:
Surface Pro
Breakout Graphic Amplifier (With Geforce GTX 980 4GB Ram)
27 inch 4K monitor
You can use the Surface on the go and when you feel like doing some serious gaming, just plug in the graphic amplifier and use the external monitor plugged into it to play real games. Then unplug and go portable again.
You don't need 2 devices. I know some of you say you replaced your desktops, then this is not for you, but I do Video Editing, 3D Modeling, and play Video Games.
BTW, Thunderbolt doesn't have enough throughput for a top Graphics Card, like the GTX 980, that's why Alienware went with PCI-E.
P.S. The way the Graphics Amplifier works on Alienware laptops is that when it's plugged in, the onboard graphics gets disabled and only the Graphics in the Amplifier is used.