Merlin VSM-MM v. VSM-MX

I've searched the Merlin webpage, the Agon archives and Google for the answer to this question, but couldn't find one. So if you know of a thread, please direct me to it.

Otherwise, my question is (and forgive me for my ignorance):

Besides the premium gloss finish, what are the differences between the VSM-MX and the VSM-MM? I'm interested in hearing about both technical/engineering differences and noticeable audio differences.

Also, I've heard that the different wiring harnesses optimized for tubes or for SS (as discussed in a footnote on the Merlin price list page) is no longer an issue with the MM/MX. Is that true?

Thanks much.