I'll just say that I had a simuliar experience with the same person. I decided not to go there. He seemed to be to busy to help me and answer all of my questions over the phone and so I waited. I feel like as a paying customer you need to make me feel good about the experience! Now my car is getting tuned by Ash, what more can a Z owner ask for! Great guy, awesome customer service. I drove 12 hours round trip to drop my car off with him!
Do what you feel is right! No one can make that decision for you.