I have 3 Vigiers with ridiculous low string action. There are, indeed, little differences between them. The latest, a Vigier Arpege 6 string has a string action of no more than 1mm at the 24. fret for all strings from B to C (open string but with zero fret), I never thought possible. I have a drop a tuning (two halftones lower) on the Arpege.