Stein has a good reputation and I liked what I saw at his booth at Oshkosh. That said, my first panel was done by Aerotronics and I liked it so much that I went straight to Gary when I was planning my -10. Turns out they were doing the groundwork for making harnesses for the -10. They had worked with a -10 builder getting measurements and building his harness. Now they are customizing what they learned from that project and are getting ready to pre-wire mine. It wasn't hard to do the peripheral wiring in my -6A but the Aerotronics harness takes it up a notch with professional bundling - much neater than I am capable of. Making the connections on the -6A wasn't difficult and I got (and still get) great support from the gang at Aerotronics whenever I had questions.
I admire the people who can do their own avionics but if you are going to hire it out, as I did, I can heartily recommend them. No need for a local shop.