Testers and feedback are wanted very much: I only have one hardware configuration I can test on, and I'd be grateful for anyone to try it and report their experience--especially for multi-gpu pass-through (as I can only test single at this time.)
In the "i can only sort of use one OS at a time" sense, it is like dual booting, but the transition is much faster (since there is no reboot required) and, as mentioned, your host doesn't really go away (you can still SSH into it from another PC on your network.)