Any risk/downside in installing W10 in Bootcamp instead of VM?
I've been running it via Boot Camp on my 2014 rMBP since the first tech preview dropped.
It takes awhile to boot into Windows 10, freezes frequently even when nothing very demanding is running, frequently fails to update (though, I'm sure this is my fault in some way), and I run into an issue when I boot back into Yosemite where my displays are set to the wrong resolution, and mirroring is enabled despite that setting being disabled before booting into Windows.
Aside from that, it works pretty well once it gets going.