I already upgraded to Win 8 Pro and decided to try this dual boot with Win 7 on the VHD. I followed all the directions, and it works almost perfectly, except for one little nagging detail: the boot screen doesn't look as nice as the Win 8 styled one. I only get the plain boring white-on-black text. Is this because my Win 8 partition is #4 of a Boot Camp system (iMac)? The BC setup means my HD is GUID partitioned and using EFI (not the usual MBR/BIOS). I'm curious how I can return to that slick OS selection screen, but it's definitely not a dealbreaker for being able to dual boot on a single partition!