After some doubt I bought a X-Keys 128 with the special V-Mix buttons.
First of all.... you need to be aware that it comes as a package to assemble yourself.
You have to remove some parts with a set of pliers (small needle nosed) to get the plungers out.
Don't worry that force is needed. It actually does NOT break your (expensive) keyboard.

If you don't remove the plungers, the springs under the plungers will push the cover that you can put over these unused buttons, out.

The x-keys company has a template to import in V-mix, and that saves a lot of work :)
However, for guys like me with a very long TV making history, the bottom rail should be PGM and not PVM
I know that nowadays many operators work with selecting PVM first and switch with TAKE, but us oldies are used to having the bottom rail switch immediately :)

please find the 2 templates herewith.
Best wishes, Harpert XKE-124 T-bar templates.zip (6kb) downloaded 57 time(s).