This looks to be a much better prospect for owners of gaming laptops looking for a GPU upgrade. If it works that is!
https://www.gigabyte.com/Graphics-Card/GV-N1070IXEB-8GD#kfPricing is looking at less than £500 but it includes a GTX 1070. My only criticism is that it doesn't have an Ethernet LAN port but other than that it is far better value than the XG Station 2. I'll be keeping an eye out for reviews it may be the perfect companion to my G752VT.