I am a Nor Vise rep in BC.
Obviously, I love them, that is why I became a rep.
The two only issues I have ever had with the vise are:
-As others have stated, the auto bobbin, if the thread breaks you need to re-spool it and that can take a minute.
-The one Big beef I have, (And I have spoke to Norm about it) is the Material holder. On most rotary vises, the Holder or spring like item is easily accessed, with the Nor-Vise, it is difficult to use because of the size of the main Mandrel.
Besides these Items, Since starting to use the Nor-Vise, my tying has speed up exponentially!!!!
Rick