I downloaded the media creation tool, made a USB drive and used the exe on that to upgrade the current system. That way I would have a bootable drive if anything went tits up (which it did not).
After upgrading I installed the regular Asus Driver Package from the eSupport folder. (Just hit the .exe in the main folder).
Then I could FINALLY lose that bloody 15GB recovery partition (using diskpart and the "delete override" command.)
After realizing how effing cool Win 10 is, I also deleted the windows.old (Win 8.1 Recovery) and now I have a fully functional G751JY with Win 10 on it and so far, I love it!
Geforce Experience, Drivers, all working so far!
I have to say, even the Edge Browser is a NICE piece of work. Let's hope they don't ruin it!
Win 10 really has a small footprint: 31.5 GB!
Oh, forgot to say before anything I used winflash to get BIOS 208.
ASUS G751JY | i7-4720HQ | GTX 980M | 16GB RAM | M.2 SSD + HDD | WIN 10