The fact that there is a wall between the Linux stuff and Windows stuff (“You can't edit a file that originates from the Linux userland inside Windows.”) sounds very hacky to me.
It's not a VM, it's like the inverse of WINE... it's a compatibility layer... and that one piece (not being able to edit files in the LSW from windows/gui) is what keeps me off of it.
I do.. and samba to use a GUI editor against files in the VM. That said, there's the overhead of a full VM... some of the same reasons one would use WINE instead of a full Windows VM.