Numerous people are using Speed INC, in Schaumburg. I just had Bob Kurgan tune my car after my charger install, he used their Dyno. Speed INC looks to be do some incredible work based on my overview of the shop and the numerous customers that picked up their cars the day I was there.
I do all my own work outside of tuning, so I don't have any need to use any shops, but based on the kudos I have heard given on the forums and the things I saw in person, I must say they got their **** together over there.