My daily driver is an 178 cm Legend 8000 (79 mm width ski). The last time I had it worked on with a wax and edge, I don't know if it was a machine or hand job :-) (sorry, couldn't resist). Whatever it was, I loved the way it skied in mixed conditions including crusty hardpack and mashed potatoes. I recently tried my other skis 183 cm iM82 which is also a great ski, but a bit different. What I did notice is that it didn't seem to hold an edge as well - yeah, I know it is slightly longer and a bit wider.
So, I took it to a local pro shop and had them check the edge on this ski - they used a fancy contraption. After extensive measurements, they said it was set up as 2 deg base / 2 deg edge which was quite a bit different than what usually comes from the Head factory (1/1 ??). The only thing I remember ever having done on that pair, which I haven't skied much at all, was a bit of detuning at the tip. The tech was surprised at the 2/2 and even checked his tool on a number of other known hand-edged skis. The tool works perfectly.
Now, I mentioned that I will probably have the edge reset to base 1 and edge 2 to match the other skis. They said that is what they normally do on skis with their machine. What I was surprised at is that they said that the machine can easily change the base from 2 to 1 by just grinding the edges. I mentioned that I thought they would need to do a base grind too then since you are going from a deeper angle to a shallower angle. They said it wasn't necessary. That doesn't seem to be right; wouldn't that end up with a high base (closer to snow) relative to the edge? Or is there enough tolerance in that dimension that it won't matter on a relatively new pair of skis?