EDIT: I left a poor review about Mac Autosport in Parker and everything has been righted more than needed. I initially had to pay to correct a tune, but after a conversation with the shop owner, he told me I shouldn't have had to pay. I needed some more work done on my supercharger and went back to MAC and even though some extra time was needed to complete the project I was only billed at the quoted price. Everyone at the shop is very knowledgeable and helpful. I just had to update my review to reflect the corrected help I received at the shop.

I don't know the specifics of your situation so I can't speak to it. However, I have never had any problems with MAC. They have always stood behind their work and made sure everything was addressed if I had any problems that cropped up later.

I'm also sure the CEL's had nothing to do with the tune. I got one a week later and it was my MAP sensor freaking out because of the boosted air pressure. It was an easy fix, just changed the limit on the senor. :)