Typically I take my skis in when needed for a base grind - start of the season is just around the corner (for me) and in they go after a few years of just regular maintenance. The shop has a wintersteiger and the tech asked me what type of structure I wanted. I guess the machines these days have the ability to make all sorts of patterns - my old skis (which are the one to be ground) are a pair of Dynastar Speed Couse Ti - if I look closely fine linear structure (tip to tail) - BUT if I look at my new skis (Head iRace) they have a angular crossed structure.
So if I look at the Wintersteiger web site there is a picture of different structures - angular crossed, arrow, wave and more.. why all the choices? And when asked what structure (pattern) does it make much of a difference?