Level 10 is a stand up shop and does great work for our 7A/T's. I had mine done with their "bulletproof" package rated to 700whp.
I had a chance to visit them as well when they had my car and the guys at the shop are very personable and take time to do things right.
I have a complete write up on myg37:
Review Level 10 Performance Transmissions - MyG37