https://www.gigabyte.com/Graphics-Card/GV-N1080IXEB-8GD#kf
Which you can get in the $500 range which has a GTX 1080.
This eGPU is $699 and has a less powerful AMD 580.
For Windows, the 1070 / 1080 boxes are better deals, sure, but 1080 box is not 500 but 700. https://www.newegg.com/Product/Product.aspx?Item=N82E1681493..., even the 1070 is more than 500 https://www.newegg.com/Product/Product.aspx?Item=N82E1681412...
You are paying a lot for the cool looking case, USB hub and PSU.
I would have hoped that they would have put a premium graphics card like a AMD Vega64 or 1080 in to justify the premium price.
https://www.gigabyte.com/Graphics-Card/GV-N1080IXEB-8GD#kf
Which you can get in the $500 range which has a GTX 1080.
This eGPU is $699 and has a less powerful AMD 580.