I've got most of the MIG pigments in my collection now, I haven't really used them myself besides of some quick tests..
But a friend of mine, quite a reference when it comes to building 1/35th vehicles, did a demo some weeks ago and I found it to be quite astonishing.
The positive thing about these pigments is that they are very fine and you don't have have to "grind" them first like pastel chalk....