Don, I agree that MX is one of the two tools that can be used for 3D editing at the moment (without additional plugins from a third party). So, that is fine for me. But you have to purchase this MVC plugin, it is not very expensive, here in Europe they sell it for 5 Euros. Then you are able to import both Sony TD10 files, but also JVC TD1 files.
However, that is only a MVC-decoder, necessary to read the files. But you cannot encode that to MVC - since there is no encoder at all. There are other output possiblities, side by side or top bottom for example. But no MVC encoder and therefore no 3D Blu Ray according to the Blu Ray specification.