I haven't, but there is a easy quick test: Ask them if they have ever laced, and trued a Norton 19" front wheel with disk application. If they answer confidently, then they must be good. The Norton front disk wheel with 4 different spokes, an off-set that would baffle Da Vinci, Is reputed to be the most difficult to build.
You can go to Buchanan's, they performed this miracle regularly (also on the West Coast).