And I'm with Reza I'd never tell them to set it to " factory spec" and make sure you leave the place with a print out of the the settings. That is wait Stephen's comment is all about....

I once made a shop put my car back on the rack just to get the alignment readings again as they didn't print them off like i requested when i walked in.

I now go to a shop where they essentially let me do my own alignments. So much more comfortable with that.