Desktop GPUs on Laptops?

[SILENT KNIGHT]

So, I was looking around when I came across something that I thought was impossible. Apparently, external graphics cards for laptops are a thing and work with old laptops with integrated cards. Below is the video I found based on this.

Would anyone recommend anything like this at all? What are the chances of it working? Is it a viable options or is there a potential for being scammed because this thing doesn't really exist? I'm tempted on getting one but I just want to know what you guys think.

I'm currently using a Pavilion G6 noteboook thingy if that helps.

seems really nice, well i wold join you in getting one cause my laptop has a ati x1600 graphics card its 128mb but have pushed it a bit with company of heros and other games but that would be awesome for us old laptop users.