To answer your question directly, I have not tested Virtualbox. I'll be the first to admit I screw around with this stuff just as a hobbyist.
I managed to bork my Virtualbox setup some time ago when I was messing around trying something out. I have no idea how to restore it.
If you can give me some suggestions to fix my installation, or walk me through steps to restore Virtualbox, I'll try it for you. Thanks for your work on Neptune, it's my "daily driver" at home. Does what I want without much muss or fuss, and still have the tools to let me tinker, sometimes more successfully than others.