I've owned the Razer blade stealth (i7 6700u / 8gb RAM and a 512gb NVMe drive) paired it with the core and my 1080 from my desktop.
It ISN'T bad, but it's definitely more of a nuisance than to have a laptop with a GPU already in it.
I ended up trading it for my Aorus X3 Plus i7-4710HQ / GTX 970m / 16gb RAM and 512gb of SSDs in RAID 0 + an oculus rift + touch. Sold that laptop lol cause I rarely ever used it.
The core is a very cool concept, and has a solid build quality. But like I said, it's more of a hassle to lug all that shit around tbh/