I do but I have yet to use it, any questions about it? It just runs the proper wires from the J1772 to the NEMA 5-15 (computer-style) plug. No intelligence in it as far as I'm aware. I could bring it in tomorrow and try it out, I just don't usually like taking up the L2 parking spots when 110V charges just as fast (err, slow) and I'm full when I come out at the end of the work day regardless. I just bought it for flexibility.
I have two Quiq chargers from Zero (not the best deal ever it sounds like, I might look into something more powerful some day), but I could probably use a splitter like this to run both of them off a J1772, then Y those back into the quick-charge port on the bike.
http://sheeline.manufacturer.globalsources.com/si/6008800300439/pdtl/AC-power/1052693046/Power-Cords.htmSeems an unlikely situation though.
I've yet to track down a NEMA 14-50 to C13 plug so I've never had a way to run my chargers on the 220V in my garage.