+2 Cremer for fret work
I can say from personal experience that my best experiences have been with Cremer guitar works. I have been going to them for years. The only issue is that Aurora is a bit of a drive from Chicago and they get so much work that you need to book in advance when you will drop off and pick up an instrument. Well worth it if this is not a major issue. ( g4string, I would imagine Aurora may be easier to get to than Chicago from Rockford)
In fact I had them build a custom jazz bass for me years ago.
Later I needed a quick setup on that bass and did not have the time to schedule taking it to Cremers so I took to Lakland. Before lakland started the skyline series, for a time they were willing to work on not lakland basses. When I picked it up Dan and their main tech (forgot his name), both super nice guys,
could not say enough about the fret work on the bass.
I also have wanted to hear more about Chicago Tech.
I don't wish to bad talk anyone but I have had some mixed experiences with a couple of chicago techs. Obviously other have had different experiences from mine.
I have had 2 friends that have had less than idea experience with Specimen.
The one time I when to Specimen and asked the owner what he would charge to refinish a fender guitar body on a guitar I was considering buying he quoted me $1200. I felt the owner was rather hard to communicate with.
Tim Schroeder does do good work. I met him years ago when he work alone out of a small shop. The issue I had with his current shop is that if you take an instruments there you are not assured he will be there or if he will be the one who works on your instrument. He also has a number of younger people working on the instruments that are brought in. When I brought in my instrument I felt they did not do the work I asked or paid for and I never saw Tim either time I was in the shop.
I was recommend Geoff Benge.
http://www.geoffbengesguitarshop.com/index.html
I am very curious to hear if anyone has had experiences with him.