Sorry if this has been suggested already, i had a bit of a look through and couldn't find one.
it would be really cool if you could review some cheap egpu solutions like this one:
http://www.banggood.com/Mini-PCI-E-Version-V8_0-EXP-GDC-Beast-Laptop-External-Independent-Video-Card-Dock-p-1011222.html
I have been thinking about getting one for a while now as i don't have enough money for something like a razer core and a laptop with thunderbolt (and desktop is not a viable option for my situation).
It would be really interesting to see if these types of budget solutions are any use and how much they will bottle neck a modern(ish) gpu.