realskiers

The machine will also grind a structure into the base of the skis that you can't readily do with a file.


I agree with Gary, and might go even a step further.
If you can identify a trustworthy shop (and that's probably the biggest point), ask them to griind the base and do the base and edge bevel (but then check yourself).  That might also give you a lot of information about whether or not you want to use and recommend them in the future.


Alternatively, send them to JBotti's SkiHaus somewhere in Montana?? 


Addendum:  I heartily recommend Precision Ski in Frisco Colorado, right across the road from WalMart. They know what they are doing and have some laser machine that is even better than their older Wintersteiger machine.  What the laser does (other than marketing hype) I have no idea.
A 2008 demo of what the machines do.